12583 + Mcqs in Physics Page 210 McqOptions

10451.	Assertion : The spring constant of a spring is k. When it is divided into n equal parts, then spring constant of one piece is k/n. Reason : The spring constant is independent of material used for the spring.
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

10452.	Assertion : Two balls of different masses are thrown vertically upward with same speed. They will pass through their point of projection in the downward direction with the same speed. Reason : The maximum height and downward velocity attained at the point of projection are independent of the mass of the ball.
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

10453.	Assertion : In extreme position of a particle executing S.H.M., both velocity and acceleration are zero. Reason : In S.H.M., acceleration always acts towards mean position.
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

10454.	A long solenoid has a radius a and number of turns per unit length is n. If it carries a current i, then the magnetic field on its axis is directly proportional to [MP PMT 1994]
A.	ani
B.	ni
C.	\[\frac{ni}{a}\]
D.	\[{{n}^{2}}i\]
Answer» C. \[\frac{ni}{a}\]

Discussion

10455.	An air filled parallel plate capacitor has capacity C. If distance between plates is doubled and it is immersed in a liquid then capacity becomes twice. Dielectric constant of the liquid is [BCECE 2004]
A.	1
B.	2
C.	3
D.	4
Answer» E.

Discussion

10456.	Water rises in a vertical capillary tube upto a height of 2.0 cm . If the tube is inclined at an angle of \[{{60}^{o}}\] with the vertical, then upto what length the water will rise in the tube [UPSEAT 2002]
A.	2.0 cm
B.	4.0 cm
C.	\[\frac{4}{\sqrt{3}}cm\]
D.	\[2\sqrt{2\,}cm\]
Answer» C. \[\frac{4}{\sqrt{3}}cm\]

Discussion

10457.	A body of mass 5 kg is moving with a momentum of 10 kg-m/s. A force of 0.2 N acts on it in the direction of motion of the body for 10 seconds. The increase in its kinetic energy is [MP PET 1999]
A.	2.8 Joule
B.	3.2 Joule
C.	3.8 Joule
D.	4.4 Joule
Answer» E.

Discussion

10458.	Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is [Kerala PET 2002; DCE 2002]
A.	\[{{\mu }_{o}}i/r\]
B.	\[4{{\mu }_{o}}i/r\]
C.	Zero
D.	\[{{\mu }_{o}}i/4r\]
Answer» D. \[{{\mu }_{o}}i/4r\]

Discussion

10459.	Assertion : If earth suddenly stops rotating about its axis, then the value of acceleration due to gravity will become same at all the places. Reason : The value of acceleration due to gravity is independent of rotation of earth.
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

10460.	A hydrogen atom (ionisation potential 13.6 eV) makes a transition from third excited state to first excited state. The energy of the photon emitted in the process is [MNR 1995]
A.	1.89 eV
B.	2.55 eV
C.	12.09 eV
D.	12.75 Ev
Answer» C. 12.09 eV

Discussion

10461.	The radius of a metallic sphere if its capacitance is \[1/9\,F\], is [KCET 1999; Pb. PET 2001]
A.	\[{{10}^{6}}\,m\]
B.	\[{{10}^{7}}m\]
C.	\[{{10}^{9}}\,m\]
D.	\[{{10}^{8}}\,m\]
Answer» D. \[{{10}^{8}}\,m\]

Discussion

10462.	A cycle tyre bursts suddenly. This represents an [SCRA 1994]
A.	Isothermal process
B.	Isobaric process
C.	Isochoric process
D.	Adiabatic process
Answer» E.

Discussion

10463.	A sound source of frequency 170 Hz is placed near a wall. A man walking from a source towards the wall finds that there is a periodic rise and fall of sound intensity. If the speed of sound in air is 340 m/s the distance (in metres) separating the two adjacent positions of minimum intensity is [MNR 1992; UPSEAT 2000; CPMT 2002]
A.	1/2
B.	1
C.	3/2
D.	2
Answer» C. 3/2

Discussion

10464.	The disc of a siren containing 60 holes rotates at a constant speed of 360 rpm. The emitted sound is in unison with a tuning fork of frequency [KCET 2005]
A.	10 Hz
B.	360 Hz
C.	216 Hz
D.	6 Hz
Answer» C. 216 Hz

Discussion

10465.	A 4 mF condenser is charged to 400 V and then its plates are joined through a resistance. The heat produced in the resistance is [UPSEAT 2004]
A.	0.16 J
B.	0.32 J
C.	0.64 J
D.	1.28 J
Answer» C. 0.64 J

Discussion

10466.	The capacitance of a parallel plate condenser does not depend on [MP PET 1994]
A.	Area of the plates
B.	Medium between the plates
C.	Distance between the plates
D.	Metal of the plates
Answer» E.

Discussion

10467.	A 10 micro-farad capacitor is charged to 500 V and then its plates are joined together through a resistance of 10 ohm. The heat produced in the resistance is [Orissa JEE 2003]
A.	500 J
B.	250 J
C.	125 J
D.	1.25 J
Answer» E.

Discussion

10468.	A total charge Q is broken in two parts \[{{Q}_{1}}\] and \[{{Q}_{2}}\] and they are placed at a distance \[R\] from each other. The maximum force of repulsion between them will occur, when [MP PET 1990]
A.	\[{{Q}_{2}}=\frac{Q}{R},\ {{Q}_{1}}=Q-\frac{Q}{R}\]
B.	\[{{Q}_{2}}=\frac{Q}{4},\ {{Q}_{1}}=Q-\frac{2Q}{3}\]
C.	\[{{Q}_{2}}=\frac{Q}{4},\ {{Q}_{1}}=\frac{3Q}{4}\]
D.	\[{{Q}_{1}}=\frac{Q}{2},\ {{Q}_{2}}=\frac{Q}{2}\]
Answer» D. \[{{Q}_{1}}=\frac{Q}{2},\ {{Q}_{2}}=\frac{Q}{2}\]

Discussion

10469.	At what height over the earth's pole, the free fall acceleration decreases by one percent (assume the radius of earth to be 6400 km) [KCET 1994]
A.	32 km
B.	80 km
C.	1.253 km
D.	64 km
Answer» B. 80 km

Discussion

10470.	A parallel plate capacitor carries a charge \[q\]. The distance between the plates is doubled by application of a force. The work done by the force is [MP PET 2003]
A.	Zero
B.	\[\frac{{{q}^{2}}}{C}\]
C.	\[\frac{{{q}^{2}}}{2C}\]
D.	\[\frac{{{q}^{2}}}{4C}\]
Answer» D. \[\frac{{{q}^{2}}}{4C}\]

Discussion

10471.	Which of the following is not an application of eddy currents [CBSE PMT 1989]
A.	Induction furnace
B.	Galvanometer damping
C.	Speedometer of automobiles
D.	X-ray crystallography
Answer» E.

Discussion

10472.	The intensity of electric field at a point between the plates of a charged capacitor [MP PMT 1996]
A.	Is directly proportional to the distance between the plates
B.	Is inversely proportional to the distance between the plates
C.	Is inversely proportional to the square of the distance between the plates
D.	Does not depend upon the distance between the plates
Answer» E.

Discussion

10473.	Assertion : A work done in moving a body over a closed loop is zero for every force in nature. Reason : Work done does not depend on nature of force.
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

10474.	When vapour condenses into liquid [CPMT 1990]
A.	It absorbs heat
B.	It liberates heat
C.	Its temperature increases
D.	Its temperature decreases
Answer» C. Its temperature increases

Discussion

10475.	A 12 ohm resistor and a 0.21 henry inductor are connected in series to an ac source operating at 20 volts, 50 cycle/second. The phase angle between the current and the source voltage is [BHU 1994]
A.	30°
B.	40°
C.	80°
D.	90°
Answer» D. 90°

Discussion

10476.	For adiabatic processes \[\left( \gamma =\frac{{{C}_{p}}}{{{C}_{v}}} \right)\] [KCET 1999; MP PET 1995; CPMT 2003]
A.	\[{{P}^{\gamma }}V\] = constant
B.	\[{{T}^{\gamma }}V\]= constant
C.	\[T{{V}^{\gamma -1}}\] =constant
D.	\[T{{V}^{\gamma }}\] = constant
Answer» D. \[T{{V}^{\gamma }}\] = constant

Discussion

10477.	One metre length of wire carries a constant current. The wire is bent to form a circular loop. The magnetic field at the centre of this loop is B. The same is now bent to form a circular loop of smaller radius to have four turns in the loop. The magnetic field at the centre of this new loop is
A.	4 B
B.	16 B
C.	\[B/2\]
D.	\[B/4\]
Answer» C. \[B/2\]

Discussion

10478.	Which of the following is quantised according to Bohr?s theory of hydrogen atom [MP PMT 2004]
A.	Linear momentum of electron
B.	Angular momentum of electron
C.	Linear velocity of electron
D.	Angular velocity of electron
Answer» C. Linear velocity of electron

Discussion

10479.	In which of the following remote sensing technique is not used [Kerala PMT 2005]
A.	Forest density
B.	Pollution
C.	Wetland mapping
D.	Medical treatment
Answer» E.

Discussion

10480.	Assertion : A kinetic energy of a body is quadrupled, when its velocity is doubled. Reason : Kinetic energy is proportional to square of 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» B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Discussion

10481.	The Bulk modulus for an incompressible liquid is [BHU 2004]
A.	Zero
B.	Unity
C.	Infinity
D.	Between 0 to 1
Answer» D. Between 0 to 1

Discussion

10482.	An LCR circuit contains R = 50 W , L = 1 mH and C = 0.1 mF. The impedance of the circuit will be minimum for a frequency of [Bihar MEE 1995]
A.	\[\frac{{{10}^{5}}}{2\pi }{{s}^{-1}}\]
B.	\[\frac{{{10}^{6}}}{2\pi }{{s}^{-1}}\]
C.	\[2\pi \times {{10}^{5}}{{s}^{-1}}\]
D.	\[2\pi \times {{10}^{6}}{{s}^{-1}}\]
Answer» B. \[\frac{{{10}^{6}}}{2\pi }{{s}^{-1}}\]

Discussion

10483.	Assertion : When a magnet is brought near iron nails, only translatory force act on it. Reason : The field due to a magnet is generally uniform.
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

10484.	A car travelling at a speed of 30 km/hour is brought to a halt in 8 m by applying brakes. If the same car is travelling at 60 km/hour, it can be brought to a halt with the same braking force in [NCERT 1976]
A.	8 m
B.	16 m
C.	24 m
D.	32 m
Answer» E.

Discussion

10485.	Who discovered spin quantum number [RPMT 2000]
A.	Unlenbeck and Goudsmit
B.	Nell?s Bohr
C.	Zeeman
D.	Sommerfield
Answer» B. Nell?s Bohr

Discussion

10486.	Assertion : Displacement of a body is vector sum of the area under velocity-time graph. Reason : Displacement is a vector quantity.
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

10487.	Assertion : Radioactivity of \[{{10}^{8}}\] undecayed radioactive nuclei of half-life of 50 days is equal to that of \[1.2\times {{10}^{8}}\] number of undecayed nuclei of some other material with half-life of 60 days Reason : Radioactivity is proportional to half-life.
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

10488.	Assertion : The ferromagnetic substance do not obey Curie?s law. Reason : At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.
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

10489.	In the Ingen Hauz?s experiment the wax melts up to lengths 10 and 25 cm on two identical rods of different materials. The ratio of thermal conductivities of the two materials is [MP PET 2002]
A.	\[1:6.25\]
B.	6.25 : 1
C.	\[1:\sqrt{2.5}\]
D.	1 : 2.5
Answer» B. 6.25 : 1

Discussion

10490.	Assertion : The mass of b-particles when they are emitted is higher than the mass of electrons obtained by other means. Reason : b-particle and electron, both are similar particles.
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

10491.	Assertion : Horizontal range is same for angle of projection q and (90 ? q). Reason : Horizontal range is independent of angle of projection.
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

10492.	On heating one end of a rod, the temperature of whole rod will be uniform when
A.	K = 1
B.	K = 0
C.	K = 100
D.	\[K=\infty \]
Answer» E.

Discussion

10493.	Assertion : A bar magnet is dropped into a long vertical copper tube. Even taking air resistance as negligible, the magnet attains a constant terminal velocity. If the tube is heated, the terminal velocity gets increased. Reason : The terminal velocity depends on eddy current produced in bar magnet.
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

10494.	The ratio of secondary to the primary turns in a transformer is 3 : 2. If the power output be P, then the input power neglecting all loses must be equal to [MP PMT 1984; KCET 2003]
A.	5 P
B.	1.5 P
C.	P
D.	\[\frac{2}{5}P\]
Answer» D. \[\frac{2}{5}P\]

Discussion

10495.	An a particle is accelerated through a p.d of \[{{10}^{6}}\] volt then K.E. of particle will be [Pb. PET 2003]
A.	8 MeV
B.	4 MeV
C.	2 MeV
D.	1 MeV
Answer» D. 1 MeV

Discussion

10496.	Speed of sound in mercury at a certain temperature is 1450 m/s. Given the density of mercury as 13.6 ´ 103 kg / m3, the bulk modulus for mercury is [JIPMER 2000]
A.	2.86 ´1010 N/m3
B.	3.86 ´1010 N/m3
C.	4.86 ´1010 N/m3
D.	5.86 ´1010 N/m3
Answer» B. 3.86 ´1010 N/m3

Discussion

10497.	Assertion : Sound travel faster in solids than gases. Reason : Solid possess greater density than gases. [AIIMS 2000]
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

10498.	Assertion : The connecting wires are made of copper. Reason : The electrical conductivity of copper is high.
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

10499.	Can a metal be used as a medium for dielectric [DPMT 1999]
A.	Yes
B.	No
C.	Depends on its shape
D.	Depends on dielectric
Answer» C. Depends on its shape

Discussion

10500.	If the sum of two unit vectors is a unit vector, then magnitude of difference is [CPMT 1995; CBSE PMT 1989]
A.	\[\sqrt{2}\]
B.	\[\sqrt{3}\]
C.	\[1/\sqrt{2}\]
D.	\[\sqrt{5}\]
Answer» C. \[1/\sqrt{2}\]

Discussion

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

Assertion : The spring constant of a spring is k. When it is divided into n equal parts, then spring constant of one piece is k/n. Reason : The spring constant is independent of material used for the spring.

Assertion : In extreme position of a particle executing S.H.M., both velocity and acceleration are zero. Reason : In S.H.M., acceleration always acts towards mean position.

A long solenoid has a radius a and number of turns per unit length is n. If it carries a current i, then the magnetic field on its axis is directly proportional to [MP PMT 1994]

An air filled parallel plate capacitor has capacity C. If distance between plates is doubled and it is immersed in a liquid then capacity becomes twice. Dielectric constant of the liquid is [BCECE 2004]

Water rises in a vertical capillary tube upto a height of 2.0 cm . If the tube is inclined at an angle of \[{{60}^{o}}\] with the vertical, then upto what length the water will rise in the tube [UPSEAT 2002]

A body of mass 5 kg is moving with a momentum of 10 kg-m/s. A force of 0.2 N acts on it in the direction of motion of the body for 10 seconds. The increase in its kinetic energy is [MP PET 1999]

Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is [Kerala PET 2002; DCE 2002]

Assertion : If earth suddenly stops rotating about its axis, then the value of acceleration due to gravity will become same at all the places. Reason : The value of acceleration due to gravity is independent of rotation of earth.

A hydrogen atom (ionisation potential 13.6 eV) makes a transition from third excited state to first excited state. The energy of the photon emitted in the process is [MNR 1995]

The radius of a metallic sphere if its capacitance is \[1/9\,F\], is [KCET 1999; Pb. PET 2001]

A cycle tyre bursts suddenly. This represents an [SCRA 1994]

The disc of a siren containing 60 holes rotates at a constant speed of 360 rpm. The emitted sound is in unison with a tuning fork of frequency [KCET 2005]

A 4 mF condenser is charged to 400 V and then its plates are joined through a resistance. The heat produced in the resistance is [UPSEAT 2004]

The capacitance of a parallel plate condenser does not depend on [MP PET 1994]

A 10 micro-farad capacitor is charged to 500 V and then its plates are joined together through a resistance of 10 ohm. The heat produced in the resistance is [Orissa JEE 2003]

A total charge Q is broken in two parts \[{{Q}_{1}}\] and \[{{Q}_{2}}\] and they are placed at a distance \[R\] from each other. The maximum force of repulsion between them will occur, when [MP PET 1990]

At what height over the earth's pole, the free fall acceleration decreases by one percent (assume the radius of earth to be 6400 km) [KCET 1994]

A parallel plate capacitor carries a charge \[q\]. The distance between the plates is doubled by application of a force. The work done by the force is [MP PET 2003]

Which of the following is not an application of eddy currents [CBSE PMT 1989]

The intensity of electric field at a point between the plates of a charged capacitor [MP PMT 1996]

Assertion : A work done in moving a body over a closed loop is zero for every force in nature. Reason : Work done does not depend on nature of force.

When vapour condenses into liquid [CPMT 1990]

A 12 ohm resistor and a 0.21 henry inductor are connected in series to an ac source operating at 20 volts, 50 cycle/second. The phase angle between the current and the source voltage is [BHU 1994]

For adiabatic processes \[\left( \gamma =\frac{{{C}_{p}}}{{{C}_{v}}} \right)\] [KCET 1999; MP PET 1995; CPMT 2003]

One metre length of wire carries a constant current. The wire is bent to form a circular loop. The magnetic field at the centre of this loop is B. The same is now bent to form a circular loop of smaller radius to have four turns in the loop. The magnetic field at the centre of this new loop is

Which of the following is quantised according to Bohr?s theory of hydrogen atom [MP PMT 2004]

In which of the following remote sensing technique is not used [Kerala PMT 2005]

Assertion : A kinetic energy of a body is quadrupled, when its velocity is doubled. Reason : Kinetic energy is proportional to square of velocity.

The Bulk modulus for an incompressible liquid is [BHU 2004]

An LCR circuit contains R = 50 W , L = 1 mH and C = 0.1 mF. The impedance of the circuit will be minimum for a frequency of [Bihar MEE 1995]

Assertion : When a magnet is brought near iron nails, only translatory force act on it. Reason : The field due to a magnet is generally uniform.

A car travelling at a speed of 30 km/hour is brought to a halt in 8 m by applying brakes. If the same car is travelling at 60 km/hour, it can be brought to a halt with the same braking force in [NCERT 1976]

Who discovered spin quantum number [RPMT 2000]

Assertion : Displacement of a body is vector sum of the area under velocity-time graph. Reason : Displacement is a vector quantity.

Assertion : Radioactivity of \[{{10}^{8}}\] undecayed radioactive nuclei of half-life of 50 days is equal to that of \[1.2\times {{10}^{8}}\] number of undecayed nuclei of some other material with half-life of 60 days Reason : Radioactivity is proportional to half-life.

Assertion : The ferromagnetic substance do not obey Curie?s law. Reason : At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.

In the Ingen Hauz?s experiment the wax melts up to lengths 10 and 25 cm on two identical rods of different materials. The ratio of thermal conductivities of the two materials is [MP PET 2002]

Assertion : The mass of b-particles when they are emitted is higher than the mass of electrons obtained by other means. Reason : b-particle and electron, both are similar particles.

Assertion : Horizontal range is same for angle of projection q and (90 ? q). Reason : Horizontal range is independent of angle of projection.

On heating one end of a rod, the temperature of whole rod will be uniform when

The ratio of secondary to the primary turns in a transformer is 3 : 2. If the power output be P, then the input power neglecting all loses must be equal to [MP PMT 1984; KCET 2003]

An a particle is accelerated through a p.d of \[{{10}^{6}}\] volt then K.E. of particle will be [Pb. PET 2003]

Speed of sound in mercury at a certain temperature is 1450 m/s. Given the density of mercury as 13.6 ´ 103 kg / m3, the bulk modulus for mercury is [JIPMER 2000]

Assertion : Sound travel faster in solids than gases. Reason : Solid possess greater density than gases. [AIIMS 2000]

Assertion : The connecting wires are made of copper. Reason : The electrical conductivity of copper is high.

Can a metal be used as a medium for dielectric [DPMT 1999]

If the sum of two unit vectors is a unit vector, then magnitude of difference is [CPMT 1995; CBSE PMT 1989]