12583 + Mcqs in Physics Page 198 McqOptions

9851.	A capacitor is charged to 200 volt it has 0.1 coulomb charge. When it is discharged, energy will be [MP PET 2003]
A.	1 J
B.	4 J
C.	10 J
D.	20 J
Answer» D. 20 J

Discussion

9852.	Which of the following is true [MP PET 1993]
A.	Lyman series is a continuous spectrum
B.	Paschen series is a line spectrum in the infrared
C.	Balmer series is a line spectrum in the ultraviolet
D.	The spectral series formula can be derived from the Rutherford model of the hydrogen atom
Answer» C. Balmer series is a line spectrum in the ultraviolet

Discussion

9853.	If an electron jumps from 1st orbital to 3rd orbital, then it will [AFMC 1996]
A.	Absorb energy
B.	Release energy
C.	No gain of energy
D.	None of these
Answer» B. Release energy

Discussion

9854.	Assertion : When an automobile while going too fast around a curve overturns, its inner wheels leave the ground first. Reason : For a safe turn the velocity of automobile should be less than the value of safe limit velocity.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» C. If assertion is true but reason is false.

Discussion

9855.	The pressure and density of a diatomic gas \[(\gamma =7/5)\] change adiabatically from (P, d) to (P', d'). If \[\frac{d'}{d}=32\], then \[\frac{P'}{P}\] should be [CPMT 1982; EAMCET 2001]
A.	1/128
B.	32
C.	128
D.	None of the above
Answer» D. None of the above

Discussion

9856.	A spherical planet far out in space has a mass \[{{M}_{0}}\] and diameter \[{{D}_{0}}\]. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity which is equal to [MP PMT 1987; DPMT 2002]
A.	\[G{{M}_{0}}/D_{0}^{2}\]
B.	\[4mG{{M}_{0}}/D_{0}^{2}\]
C.	\[4G{{M}_{0}}/D_{0}^{2}\]
D.	\[Gm{{M}_{0}}/D_{0}^{2}\]
Answer» D. \[Gm{{M}_{0}}/D_{0}^{2}\]

Discussion

9857.	Two copper balls, each weighing 10g are kept in air 10 cm apart. If one electron from every \[{{10}^{6}}\] atoms is transferred from one ball to the other, the coulomb force between them is (atomic weight of copper is 63.5) [KCET 2002]
A.	\[2.0\times {{10}^{10}}\]N
B.	\[2.0\times {{10}^{4}}\]N
C.	\[2.0\times {{10}^{8}}\]N
D.	\[2.0\times {{10}^{6}}\]N
Answer» D. \[2.0\times {{10}^{6}}\]N

Discussion

9858.	Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion : Smaller the orbit of the planet around the sun, shorter is the time it takes to complete one revolution. Reason : According to Kepler?s third law of planetary motion, square of time period is proportional to cube of mean distance from sun.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

9859.	A current of 16 ampere flows through molten NaCl for 10 minute. The amount of metallic sodium that appears at the negative electrode would be [EAMCET 1984]
A.	0.23 gm
B.	1.15 gm
C.	2.3 gm
D.	11.5 gm
Answer» D. 11.5 gm

Discussion

9860.	The beats are produced by two sound sources of same amplitude and of nearly equal frequencies. The maximum intensity of beats will be ...... that of one source [CPMT 1999]
A.	Same
B.	Double
C.	Four times
D.	Eight times
Answer» D. Eight times

Discussion

9861.	Assertion : Two similar trains are moving along the equatorial line with the same speed but in opposite direction. They will exert equal pressure on the rails. Reason : In uniform circular motion the magnitude of acceleration remains constant but the direction continuously changes.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» F.

Discussion

9862.	As the electron in Bohr orbit of Hydrogen atom passes from state \[n=2\] to \[n=1\], the kinetic energy K and potential energy U change as [MP PET 2005]
A.	K two-fold, U four-fold
B.	K four-fold, U two-fold
C.	K four-fold, U also four-fold
D.	K two-fold, U also two-fold
Answer» D. K two-fold, U also two-fold

Discussion

9863.	Assertion : In practical application, power rating of resistance is not important. Reason : Property of resistance remain same even at high temperature.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» E. If assertion is false but reason is true.

Discussion

9864.	Dynamo is a device for converting
A.	Electrical energy into mechanical energy
B.	Mechanical energy into electrical energy
C.	Chemical energy into mechanical energy
D.	Mechanical energy into chemical energy
Answer» C. Chemical energy into mechanical energy

Discussion

9865.	The energy stored in a condenser is in the form of [J & K CET 2004]
A.	Kinetic energy
B.	Potential energy
C.	Elastic energy
D.	Magnetic energy
Answer» C. Elastic energy

Discussion

9866.	Magnetic effect of current was discovered by [MP PET 1994]
A.	Faraday
B.	Oersted
C.	Ampere
D.	Bohr
Answer» C. Ampere

Discussion

9867.	The frequency of 1st line of Balmer series in \[{{H}_{2}}\] atom is \[{{\nu }_{0}}\]. The frequency of line emitted by singly ionised He atom is [CPMT 2002]
A.	\[2{{\nu }_{0}}\]
B.	\[4{{\nu }_{0}}\]
C.	\[{{\nu }_{0}}/2\]
D.	\[{{\nu }_{0}}/4\]
Answer» C. \[{{\nu }_{0}}/2\]

Discussion

9868.	To deposit one litre of hydrogen at 22.4 atmosphere from acidulaled water, the quantity of electricity that must pass through is [BVP 2003]
A.	1 coulomb
B.	22.4 coulomb
C.	96500 coulomb
D.	193000 coulomb
Answer» E.

Discussion

9869.	Assertion : When a light wave travels from a rarer to a denser medium, it loses speed. The reduction in speed imply a reduction in energy carried by the light wave. Reason : The energy of a wave is proportional to velocity of wave.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» E. If assertion is false but reason is true.

Discussion

9870.	Two concentric circular coils of ten turns each are situated in the same plane. Their radii are 20 and 40 cm and they carry respectively 0.2 and 0.3 ampere current in opposite direction. The magnetic field in \[weber/{{m}^{2}}\] at the centre is [MP PMT 1994]
A.	\[\frac{35}{4}{{\mu }_{0}}\]
B.	\[\frac{{{\mu }_{0}}}{80}\]
C.	\[\frac{7}{80}{{\mu }_{0}}\]
D.	\[\frac{5}{4}{{\mu }_{0}}\]
Answer» E.

Discussion

9871.	When a capillary is dipped in water, water rises 0.015 m in it. If the surface tension of water is\[75\times {{10}^{3}}N/m\], the radius of capillary is [RPMT 2003]
A.	0.1 mm
B.	0.5 mm
C.	1 mm
D.	2 mm
Answer» D. 2 mm

Discussion

9872.	Assertion : Two P-N junction diodes placed back to back, will work as a NPN transistor. Reason : The P-region of two PN junction diodes back to back will form the base of NPN transistor.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» E. If assertion is false but reason is true.

Discussion

9873.	According to Bohr's theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be [MP PET 1999; KCET 2003]
A.	\[2\pi h\]
B.	\[\pi h\]
C.	\[\frac{h}{\pi }\]
D.	\[\frac{2h}{\pi }\]
Answer» D. \[\frac{2h}{\pi }\]

Discussion

9874.	Assertion : A P-N photodiode is made from a semiconductor for which Eg = 2.8 eV. This photo diode will not detect the wavelength of 6000 nm. Reason : A PN photodiode detect wavelength l if \[\frac{hc}{\lambda }>{{E}_{g}}\].
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

9875.	The ends of two rods of different materials with their thermal conductivities, radii of cross-sections and lengths all are in the ratio 1 : 2 are maintained at the same temperature difference. If the rate of flow of heat in the larger rod is 4 \[4\ cal/\sec \], that in the shorter rod in \[cal/\sec \] will be [EAMCET 1986]
A.	1
B.	2
C.	8
D.	16
Answer» B. 2

Discussion

9876.	A device which converts electrical energy into mechanical energy is [KCET 2001]
A.	Dynamo
B.	generator
C.	Electric motor
D.	Induction coil
Answer» D. Induction coil

Discussion

9877.	A vertical wire kept in Z-X plane carries a current from Q to P (see figure). The magnetic field due to current will have the direction at the origin O along
A.	\[OX\]
B.	\[OX'\]
C.	\[OY\]
D.	\[OY'\]
Answer» E.

Discussion

9878.	The magnetic field at the centre of a circular coil of radius r carrying current I is \[{{B}_{1}}\]. The field at the centre of another coil of radius 2 r carrying same current I is \[{{B}_{2}}\]. The ratio \[\frac{{{B}_{1}}}{{{B}_{2}}}\] is [MP PET 2001]
A.	\[\frac{1}{2}\]
B.	1
C.	2
D.	4
Answer» D. 4

Discussion

9879.	The pressure in the tyre of a car is four times the atmospheric pressure at 300 K. If this tyre suddenly bursts, its new temperature will be \[(\gamma =1.4)\] [RPMT 1996; MP PMT 1990]
A.	\[300\,{{(4)}^{1.4/0.4}}\]
B.	\[300\,{{\left( \frac{1}{4} \right)}^{-0.4/1.4}}\]
C.	\[300\,{{(2)}^{-0.4/1.4}}\]
D.	\[300\,{{(4)}^{-0.4/1.4}}\]
Answer» E.

Discussion

9880.	If momentum is increased by 20%, then K.E. increases by [AFMC 1997; MP PMT 2004]
A.	44%
B.	55%
C.	66%
D.	77%
Answer» B. 55%

Discussion

9881.	Assertion : Microwave communication is preferred over optical communication. Reason : Microwaves provide large number of channels and band width compared to optical signals. [AIIMS 2003]
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

9882.	In an ac circuit, the power factor [Roorkee 2000]
A.	Is zero when the circuit contains an ideal resistance only
B.	Is unity when the circuit contains an ideal resistance only
C.	Is zero when the circuit contains an ideal inductance only
D.	Is unity when the circuit contains an ideal inductance only
Answer» D. Is unity when the circuit contains an ideal inductance only

Discussion

9883.	In an ac circuit, the potential difference across an inductance and resistance joined in series are respectively 16 V and 20 V. The total potential difference across the circuit is [AFMC 1998; BHU 1999]
A.	20.0 V
B.	25.6 V
C.	31.9 V
D.	53.5 V
Answer» C. 31.9 V

Discussion

9884.	The area of the plates of a parallel plate condenser is \[A\] and the distance between the plates is \[10mm\]. There are two dielectric sheets in it, one of dielectric constant 10 and thickness \[6mm\] and the other of dielectric constant 5 and thickness \[4mm\]. The capacity of the condenser is [MP PMT 1997]
A.	\[\frac{12}{35}{{\varepsilon }_{0}}A\]
B.	\[\frac{2}{3}{{\varepsilon }_{0}}A\]
C.	\[\frac{5000}{7}{{\varepsilon }_{0}}A\]
D.	\[1500\ {{\varepsilon }_{0}}A\]
Answer» D. \[1500\ {{\varepsilon }_{0}}A\]

Discussion

9885.	Calorie is defined as the amount of heat required to raise temperature of 1g of water by 1°C and it is defined under which of the following conditions [IIT-JEE (Screening) 2005]
A.	From 14.5°C to 15.5°C at 760 mm of Hg
B.	From 98.5°C to 99.5°C at 760 mm of Hg
C.	From 13.5°C to 14.5°C at 76 mm of Hg
D.	From 3.5°C to 4.5°C at 76 mm of Hg
Answer» B. From 98.5°C to 99.5°C at 760 mm of Hg

Discussion

9886.	The weight of a person is 60 kg. If he gets 105 calories heat through food and the efficiency of his body is 28%, then upto how much height he can climb (approximately) [AFMC 1997]
A.	100 m
B.	200 m
C.	400 m
D.	1000 m
Answer» C. 400 m

Discussion

9887.	A current of 0.1 A circulates around a coil of 100 turns and having a radius equal to 5 cm. The magnetic field set up at the centre of the coil is \[({{\mu }_{0}}=4\pi \times {{10}^{-7}}\,weber/ampere-metre)\] [MP PMT 1993]
A.	\[4\pi \times {{10}^{-5}}\,tesla\]
B.	\[8\pi \times {{10}^{-5}}\,tesla\]
C.	\[4\times {{10}^{-5}}\,tesla\]
D.	\[2\times {{10}^{-5}}\,tesla\]
Answer» B. \[8\pi \times {{10}^{-5}}\,tesla\]

Discussion

9888.	Assertion : If two objects of different masses have same momentum, the lighter body possess greater velocity. Reason : For all bodies momentum always remains same.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» D. If the assertion and reason both are false.

Discussion

9889.	A condenser having a capacity 2.0 micro farad is charged to \[200\ volts\]and then the plates of the capacitor are connected to a resistance wire. The heat produced in joules will be [KCET 1992; JIPMER 2000]
A.	\[4\times {{10}^{4}}J\]
B.	\[4\times {{10}^{10}}J\]
C.	\[4\times {{10}^{-2}}J\]
D.	\[2\times {{10}^{-2}}J\]
Answer» D. \[2\times {{10}^{-2}}J\]

Discussion

9890.	Two forces of 12 N and 8 N act upon a body. The resultant force on the body has maximum value of [Manipal 2003]
A.	4 N
B.	0 N
C.	20 N
D.	8 N
Answer» D. 8 N

Discussion

9891.	The amplitude of a particle executing S.H.M. with frequency of 60 Hz is 0.01 m. The maximum value of the acceleration of the particle is [DPMT 1998; CBSE PMT 1999; AFMC 2001; Pb. PMT 2001; Pb. PET 2001, 02; CPMT 1993, 95, 04; RPMT 2005; MP PMT 2005]
A.	\[144{{\pi }^{2}}m/se{{c}^{2}}\]
B.	\[144m/se{{c}^{2}}\]
C.	\[\frac{144}{{{\pi }^{2}}}m/se{{c}^{2}}\]
D.	\[288{{\pi }^{2}}m/se{{c}^{2}}\]
Answer» B. \[144m/se{{c}^{2}}\]

Discussion

9892.	An oscillator circuit consists of an inductance of 0.5mH and a capacitor of 20\[\mu F\]. The resonant frequency of the circuit is nearly [Kerala PET 2002]
A.	15.92 Hz
B.	159.2 Hz
C.	1592 Hz
D.	15910 Hz
Answer» D. 15910 Hz

Discussion

9893.	A thin metal plate P is inserted half way between the plates of a parallel plate capacitor of capacitance C in such a way that it is parallel to the two plates. The capacitance now becomes [Orissa JEE 2002]
A.	C
B.	C/2
C.	4C
D.	None of these
Answer» B. C/2

Discussion

9894.	Assertion : The water rises higher in a capillary tube of small diameter than in the capillary tube of large diameter. Reason : Height through which liquid rises in a capillary tube is inversely proportional to the diameter of the capillary tube.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

9895.	While doing his experiment, Millikan one day observed the following charges on a single drop (i) \[6.563\times {{10}^{-19}}C\] (ii) \[8.204\times {{10}^{-19}}C\] (iii) \[11.50\times {{10}^{-19}}C\] (iv) \[13.13\times {{10}^{-19}}C\] (v) \[16.48\times {{10}^{-19}}C\] (vi) \[18.09\times {{10}^{-19}}C\] From this data the value of the elementary charge (e) was found to be [MP PMT 1993]
A.	\[1.641\times {{10}^{-19}}C\]
B.	\[1.630\times {{10}^{-19}}C\]
C.	\[1.648\times {{10}^{-19}}C\]
D.	\[1.602\times {{10}^{-19}}C\]
Answer» B. \[1.630\times {{10}^{-19}}C\]

Discussion

9896.	A wire carrying current I and other carrying 2I in the same direction produces a magnetic field B at the mid point. What will be the field when 2I wire is switched off [AFMC 2005]
A.	B / 2
B.	2B
C.	B
D.	4B
Answer» D. 4B

Discussion

9897.	Assertion : Environmental damage has increased the amount of ozone in the atmosphere. Reason : Increase of ozone increases the amount of ultraviolet radiation on earth. [AIIMS 1996]
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» E. If assertion is false but reason is true.

Discussion

9898.	If scattering particles are 56 for \[{{90}^{o}}\] angle then this will be at \[{{60}^{o}}\] angle [RPMT 2000]
A.	224
B.	256
C.	98
D.	108
Answer» B. 256

Discussion

9899.	Assertion : The earth?s magnetic field does not affect the working of a moving coil galvanometer. Reason : Earth?s magnetic field is very weak.
A.	If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.	If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.	If assertion is true but reason is false.
D.	If the assertion and reason both are false.
E.	If assertion is false but reason is true.
Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

9900.	A rocket of mass 1000 kg exhausts gases at a rate of 4 kg/sec with a velocity 3000 m/s. The thrust developed on the rocket is [Orissa JEE 2005]
A.	12000 N
B.	120 N
C.	800 N
D.	200 N
Answer» B. 120 N

Discussion

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

A capacitor is charged to 200 volt it has 0.1 coulomb charge. When it is discharged, energy will be [MP PET 2003]

Which of the following is true [MP PET 1993]

If an electron jumps from 1st orbital to 3rd orbital, then it will [AFMC 1996]

Assertion : When an automobile while going too fast around a curve overturns, its inner wheels leave the ground first. Reason : For a safe turn the velocity of automobile should be less than the value of safe limit velocity.

The pressure and density of a diatomic gas \[(\gamma =7/5)\] change adiabatically from (P, d) to (P', d'). If \[\frac{d'}{d}=32\], then \[\frac{P'}{P}\] should be [CPMT 1982; EAMCET 2001]

A spherical planet far out in space has a mass \[{{M}_{0}}\] and diameter \[{{D}_{0}}\]. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity which is equal to [MP PMT 1987; DPMT 2002]

Two copper balls, each weighing 10g are kept in air 10 cm apart. If one electron from every \[{{10}^{6}}\] atoms is transferred from one ball to the other, the coulomb force between them is (atomic weight of copper is 63.5) [KCET 2002]

A current of 16 ampere flows through molten NaCl for 10 minute. The amount of metallic sodium that appears at the negative electrode would be [EAMCET 1984]

The beats are produced by two sound sources of same amplitude and of nearly equal frequencies. The maximum intensity of beats will be ...... that of one source [CPMT 1999]

Assertion : Two similar trains are moving along the equatorial line with the same speed but in opposite direction. They will exert equal pressure on the rails. Reason : In uniform circular motion the magnitude of acceleration remains constant but the direction continuously changes.

As the electron in Bohr orbit of Hydrogen atom passes from state \[n=2\] to \[n=1\], the kinetic energy K and potential energy U change as [MP PET 2005]

Assertion : In practical application, power rating of resistance is not important. Reason : Property of resistance remain same even at high temperature.

Dynamo is a device for converting

The energy stored in a condenser is in the form of [J & K CET 2004]

Magnetic effect of current was discovered by [MP PET 1994]

The frequency of 1st line of Balmer series in \[{{H}_{2}}\] atom is \[{{\nu }_{0}}\]. The frequency of line emitted by singly ionised He atom is [CPMT 2002]

To deposit one litre of hydrogen at 22.4 atmosphere from acidulaled water, the quantity of electricity that must pass through is [BVP 2003]

Assertion : When a light wave travels from a rarer to a denser medium, it loses speed. The reduction in speed imply a reduction in energy carried by the light wave. Reason : The energy of a wave is proportional to velocity of wave.

Two concentric circular coils of ten turns each are situated in the same plane. Their radii are 20 and 40 cm and they carry respectively 0.2 and 0.3 ampere current in opposite direction. The magnetic field in \[weber/{{m}^{2}}\] at the centre is [MP PMT 1994]

When a capillary is dipped in water, water rises 0.015 m in it. If the surface tension of water is\[75\times {{10}^{3}}N/m\], the radius of capillary is [RPMT 2003]

Assertion : Two P-N junction diodes placed back to back, will work as a NPN transistor. Reason : The P-region of two PN junction diodes back to back will form the base of NPN transistor.

According to Bohr's theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be [MP PET 1999; KCET 2003]

Assertion : A P-N photodiode is made from a semiconductor for which Eg = 2.8 eV. This photo diode will not detect the wavelength of 6000 nm. Reason : A PN photodiode detect wavelength l if \[\frac{hc}{\lambda }>{{E}_{g}}\].

A device which converts electrical energy into mechanical energy is [KCET 2001]

A vertical wire kept in Z-X plane carries a current from Q to P (see figure). The magnetic field due to current will have the direction at the origin O along

The magnetic field at the centre of a circular coil of radius r carrying current I is \[{{B}_{1}}\]. The field at the centre of another coil of radius 2 r carrying same current I is \[{{B}_{2}}\]. The ratio \[\frac{{{B}_{1}}}{{{B}_{2}}}\] is [MP PET 2001]

The pressure in the tyre of a car is four times the atmospheric pressure at 300 K. If this tyre suddenly bursts, its new temperature will be \[(\gamma =1.4)\] [RPMT 1996; MP PMT 1990]

If momentum is increased by 20%, then K.E. increases by [AFMC 1997; MP PMT 2004]

Assertion : Microwave communication is preferred over optical communication. Reason : Microwaves provide large number of channels and band width compared to optical signals. [AIIMS 2003]

In an ac circuit, the power factor [Roorkee 2000]

In an ac circuit, the potential difference across an inductance and resistance joined in series are respectively 16 V and 20 V. The total potential difference across the circuit is [AFMC 1998; BHU 1999]

Calorie is defined as the amount of heat required to raise temperature of 1g of water by 1°C and it is defined under which of the following conditions [IIT-JEE (Screening) 2005]

The weight of a person is 60 kg. If he gets 105 calories heat through food and the efficiency of his body is 28%, then upto how much height he can climb (approximately) [AFMC 1997]

A current of 0.1 A circulates around a coil of 100 turns and having a radius equal to 5 cm. The magnetic field set up at the centre of the coil is \[({{\mu }_{0}}=4\pi \times {{10}^{-7}}\,weber/ampere-metre)\] [MP PMT 1993]

Assertion : If two objects of different masses have same momentum, the lighter body possess greater velocity. Reason : For all bodies momentum always remains same.

A condenser having a capacity 2.0 micro farad is charged to \[200\ volts\]and then the plates of the capacitor are connected to a resistance wire. The heat produced in joules will be [KCET 1992; JIPMER 2000]

Two forces of 12 N and 8 N act upon a body. The resultant force on the body has maximum value of [Manipal 2003]

The amplitude of a particle executing S.H.M. with frequency of 60 Hz is 0.01 m. The maximum value of the acceleration of the particle is [DPMT 1998; CBSE PMT 1999; AFMC 2001; Pb. PMT 2001; Pb. PET 2001, 02; CPMT 1993, 95, 04; RPMT 2005; MP PMT 2005]

An oscillator circuit consists of an inductance of 0.5mH and a capacitor of 20\[\mu F\]. The resonant frequency of the circuit is nearly [Kerala PET 2002]

A thin metal plate P is inserted half way between the plates of a parallel plate capacitor of capacitance C in such a way that it is parallel to the two plates. The capacitance now becomes [Orissa JEE 2002]

Assertion : The water rises higher in a capillary tube of small diameter than in the capillary tube of large diameter. Reason : Height through which liquid rises in a capillary tube is inversely proportional to the diameter of the capillary tube.

A wire carrying current I and other carrying 2I in the same direction produces a magnetic field B at the mid point. What will be the field when 2I wire is switched off [AFMC 2005]

Assertion : Environmental damage has increased the amount of ozone in the atmosphere. Reason : Increase of ozone increases the amount of ultraviolet radiation on earth. [AIIMS 1996]

If scattering particles are 56 for \[{{90}^{o}}\] angle then this will be at \[{{60}^{o}}\] angle [RPMT 2000]

Assertion : The earth?s magnetic field does not affect the working of a moving coil galvanometer. Reason : Earth?s magnetic field is very weak.

A rocket of mass 1000 kg exhausts gases at a rate of 4 kg/sec with a velocity 3000 m/s. The thrust developed on the rocket is [Orissa JEE 2005]