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MCQOPTIONS
This section includes 12583 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 9101. |
The capacity of a parallel plate condenser is \[10\mu F\] without dielectric. Dielectric of constant 2 is used to fill half the distance between the plates, the new capacitance in \[\mu F\] is [EAMCET (Engg.) 1995] |
| A. | 10 |
| B. | 20 |
| C. | 15 |
| D. | 13.33 |
| Answer» E. | |
| 9102. |
A cell is connected between two points of a uniformly thick circular conductor. The magnetic field at the centre of the loop will be [MP PMT 1994] |
| A. | Zero |
| B. | \[\frac{{{\mu }_{0}}}{2a}({{i}_{1}}-{{i}_{2}})\] |
| C. | \[\frac{{{\mu }_{0}}}{2a}({{i}_{1}}+{{i}_{2}})\] |
| D. | \[\frac{{{\mu }_{0}}}{a}({{i}_{1}}+{{i}_{2}})\] (Here \[{{i}_{1}}\] and \[{{i}_{2}}\] are the currents flowing in the two parts of the circular conductor of radius ?a? and \[{{\mu }_{0}}\] has the usual meaning) |
| Answer» B. \[\frac{{{\mu }_{0}}}{2a}({{i}_{1}}-{{i}_{2}})\] | |
| 9103. |
Plane of eddy currents makes an angle with the plane of magnetic lines of force equal to |
| A. | \[{{40}^{o}}\] |
| B. | \[{{0}^{o}}\] |
| C. | \[{{90}^{o}}\] |
| D. | \[{{180}^{o}}\] |
| Answer» D. \[{{180}^{o}}\] | |
| 9104. |
A hammer of mass 1kg having speed of 50 m/s, hit a iron nail of mass 200 gm. If specific heat of iron is 0.105 cal/gm°C and half the energy is converted into heat, the raise in temperature of nail is [RPMT 1995] |
| A. | 7.1°C |
| B. | 9.2°C |
| C. | 10.5°C |
| D. | 12.1°C |
| Answer» B. 9.2°C | |
| 9105. |
In a circuit containing an inductance of zero resistance, the e.m.f. of the applied ac voltage leads the current by [CPMT 1990] |
| A. | 90o |
| B. | 45o |
| C. | 30o |
| D. | 0o |
| Answer» B. 45o | |
| 9106. |
Assertion : When ac circuit contain resistor only, its power is minimum. Reason : Power of a circuit is independent of phase angle. |
| 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. | |
| 9107. |
The acceleration of a particle in S.H.M. is [MP PMT 1993] |
| A. | Always zero |
| B. | Always constant |
| C. | Maximum at the extreme position |
| D. | Maximum at the equilibrium position |
| Answer» D. Maximum at the equilibrium position | |
| 9108. |
At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T. At the distance of 40 cm, the magnetic field will be [MP PMT 1997] |
| A. | 0.01 T |
| B. | 0.02 T |
| C. | 0.08 T |
| D. | 0.16 T |
| Answer» B. 0.02 T | |
| 9109. |
Assertion : The stars twinkle while the planets do not. Reason : The stars are much bigger in size than the planets. [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» C. If assertion is true but reason is false. | |
| 9110. |
Assertion : A red object appears dark in the yellow light Reason : A red colour is scattered less [AIIMS 2004] |
| 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. | |
| 9111. |
Assertion : For cooking in a microwave oven, food is always kept in metal containers. Reason : The energy of microwave is easily transferred to the food in metal container. |
| 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. | |
| 9112. |
Assertion : X-ray astronomy is possible only from satellites orbiting the earth. Reason : Efficiency of X-rays telescope is large as compared to any other telescope. |
| 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. | |
| 9113. |
Assertion : Owls can move freely during night. Reason : They have large number of rods on their retina. [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» D. If the assertion and reason both are false. | |
| 9114. |
Voltage and current in an ac circuit are given by \[V=5\sin \,\left( 100\pi t-\frac{\pi }{6} \right)\] and \[I=4\sin \,\left( 100\pi t+\frac{\pi }{6} \right)\] [Kerala PET 2001] |
| A. | Voltage leads the current by \[{{30}^{o}}\] |
| B. | Current leads the voltage by \[{{30}^{o}}\] |
| C. | Current leads the voltage by \[{{60}^{o}}\] |
| D. | Voltage leads the current by \[{{60}^{o}}\] |
| Answer» D. Voltage leads the current by \[{{60}^{o}}\] | |
| 9115. |
Assertion : Pascal law is the working principle of a hydraulic lift. Reason : Pressure is equal to thrust per area. |
| 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. | |
| 9116. |
Calorimeters are made of which of the following [AFMC 2000] |
| A. | Glass |
| B. | Metal |
| C. | Wood |
| D. | Either (a) or (b) |
| Answer» C. Wood | |
| 9117. |
\[\overrightarrow{A}=2\hat{i}+\hat{j},\,B=3\hat{j}-\hat{k}\] and \[\overrightarrow{C}=6\hat{i}-2\hat{k}\]. Value of \[\overrightarrow{A}-2\overrightarrow{B}+3\overrightarrow{C}\] would be |
| A. | \[20\hat{i}+5\hat{j}+4\hat{k}\] |
| B. | \[20\hat{i}-5\hat{j}-4\hat{k}\] |
| C. | \[4\hat{i}+5\hat{j}+20\hat{k}\] |
| D. | \[5\hat{i}+4\hat{j}+10\hat{k}\] |
| Answer» C. \[4\hat{i}+5\hat{j}+20\hat{k}\] | |
| 9118. |
Assertion : The resolving power of an electron microscope is higher than that of an optical microscope. Reason : The wavelength of electron is more than the wavelength of visible light. |
| 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. | |
| 9119. |
Assertion : If the angles of the base of the prism are equal, then in the position of minimum deviation, the refracted ray will pass parallel to the base of prism. Reason : In the case of minimum deviation, the angle of incidence is equal to the angle of emergence. |
| 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. | |
| 9120. |
The resultant of \[\overrightarrow{P}\] and \[\overrightarrow{Q}\] is perpendicular to \[\overrightarrow{P}\]. What is the angle between \[\overrightarrow{P}\] and \[\overrightarrow{Q}\] |
| A. | \[{{\cos }^{-1}}(P/Q)\] |
| B. | \[{{\cos }^{-1}}(-P/Q)\] |
| C. | \[{{\sin }^{-1}}\,(P/Q)\] |
| D. | \[{{\sin }^{-1}}\,(-P/Q)\] |
| Answer» C. \[{{\sin }^{-1}}\,(P/Q)\] | |
| 9121. |
One plate of parallel plate capacitor is smaller than other, then charge on smaller plate will be |
| A. | Less than other |
| B. | More than other |
| C. | Equal to other |
| D. | Will depend upon the medium between them |
| Answer» D. Will depend upon the medium between them | |
| 9122. |
Assertion : Railways tracks are laid on small sized wooden sleepers. Reason : Small sized wooden sleepers are used so that rails exert more pressure on the railway track. Due to which rail does not leave the track |
| 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. | |
| 9123. |
Assertion : We cannot produce a real image by plane or convex mirrors under any circumstances. Reason : The focal length of a convex mirror is always taken as positive. |
| 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. | |
| 9124. |
Assertion : Within a glass slab, a double convex air bubble is formed. This air bubble behaves like a converging lens. Reason : Refractive index of air is more than the refractive index of glass. |
| 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. | |
| 9125. |
Assertion : A piece of red glass is heated till it glows in dark. The colour of glowing glass would be orange. Reason : Red and orange is complementary colours. |
| 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. | |
| 9126. |
A mercury drop does not spread on a glass plate because the angle of contact between glass and mercury is [MP PMT 1984] |
| A. | Acute |
| B. | Obtuse |
| C. | Zero |
| D. | \[90{}^\circ \] |
| Answer» C. Zero | |
| 9127. |
An electron in the n = 1 orbit of hydrogen atom is bound by 13.6 eV. If a hydrogen atom is in the n = 3 state, how much energy is required to ionize it [MP PMT 1995] |
| A. | 13.6 eV |
| B. | 4.53 eV |
| C. | 3.4 eV |
| D. | 1.51 eV |
| Answer» E. | |
| 9128. |
Assertion : Light is produced in gases in the process of electric discharge through them at high pressure. Reason : At high pressure electrons of gaseous atoms collide and reach and excited state. |
| 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. | |
| 9129. |
The insulated spheres of radii \[{{R}_{1}}\] and \[{{R}_{2}}\] having charges \[{{Q}_{1}}\]and \[{{Q}_{2}}\] respectively are connected to each other. There is [NCERT 1971, 84; MP PMT 2001] |
| A. | No change in the energy of the system |
| B. | An increase in the energy of the system |
| C. | Always a decrease in the energy of the system |
| D. | A decrease in the energy of the system unless \[{{Q}_{1}}{{R}_{2}}={{Q}_{2}}{{R}_{1}}\] |
| Answer» E. | |
| 9130. |
The number of electrons in 1.6 C charge will be [RPET 2004] |
| A. | \[{{10}^{19}}\] |
| B. | \[{{10}^{20}}\] |
| C. | \[1.1\times {{10}^{19}}\] |
| D. | \[1.1\times {{10}^{2}}\] |
| Answer» B. \[{{10}^{20}}\] | |
| 9131. |
An alternating current is given by the equation \[i={{i}_{1}}\cos \omega \,t+{{i}_{2}}\sin \omega \,t\]. The r.m.s. current is given by [MP PMT 1994] |
| A. | \[\frac{1}{\sqrt{2}}({{i}_{1}}+{{i}_{2}})\] |
| B. | \[\frac{1}{\sqrt{2}}{{({{i}_{i}}+{{i}_{2}})}^{2}}\] |
| C. | \[\frac{1}{\sqrt{2}}{{(i_{1}^{2}+i_{2}^{2})}^{1/2}}\] |
| D. | \[\frac{1}{2}{{(i_{1}^{2}+i_{2}^{2})}^{1/2}}\] |
| Answer» D. \[\frac{1}{2}{{(i_{1}^{2}+i_{2}^{2})}^{1/2}}\] | |
| 9132. |
If R is the Rydberg?s constant for hydrogen the wave number of the first line in the Lyman series will be [KCET 2000] |
| A. | \[\frac{R}{4}\] |
| B. | \[\frac{3R}{4}\] |
| C. | \[\frac{R}{2}\] |
| D. | 2R |
| Answer» C. \[\frac{R}{2}\] | |
| 9133. |
Assertion : An N-type semiconductor has a large number of electrons but still it is electrically neutral. Reason : An N-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity. |
| 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. | |
| 9134. |
Assertion : The temperature coefficient of resistance is positive for metals and negative for P-type semiconductor. Reason : The effective charge carriers in metals are negatively charged whereas in P-type semiconductor they are positively charged. [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» C. If assertion is true but reason is false. | |
| 9135. |
Assertion : Electron has higher mobility than hole in a semiconductor. Reason : Mass of electron is less than the mass of hole. |
| 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. | |
| 9136. |
Assertion : A brass tumbler feels much colder than a wooden tray on a chilly day. Reason : The thermal conductivity of brass is less than that of wood. |
| 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. | |
| 9137. |
Assertion : When we start filling an empty bucket with water, the pitch of sound produced goes on decreasing. Reason : The frequency of man voice is usually higher than that of woman. |
| 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. | |
| 9138. |
Assertion : A tuning fork is made of an alloy of steel, nickel and chromium. Reason : The alloy of steel, nickel and chromium is called elinvar. |
| 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. | |
| 9139. |
Assertion : Particle velocity and wave velocity both are independent of time. Reason : For the propagation of wave motion, the medium must have the properties of elasticity and inertia. |
| 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. | |
| 9140. |
A narrow electron beam passes undeviated through an electric field \[E=3\times {{10}^{4}}volt/m\]and an overlapping magnetic field \[B=2\times {{10}^{-3}}Weber/{{m}^{2}}\]. If electric field and magnetic field are mutually perpendicular. The speed of the electrons is [MP PET 1995] |
| A. | 60 m/s |
| B. | \[10.3\times {{10}^{7}}m/s\] |
| C. | \[1.5\times {{10}^{7}}m/s\] |
| D. | \[0.67\times {{10}^{-7}}m/s\] |
| Answer» D. \[0.67\times {{10}^{-7}}m/s\] | |
| 9141. |
The armature of dc motor has \[20\,\Omega \] resistance. It draws current of 1.5 ampere when run by 220 volts dc supply. The value of back e.m.f. induced in it will be [MP PMT 1999] |
| A. | 150 V |
| B. | 170 V |
| C. | 180 V |
| D. | 190 V |
| Answer» E. | |
| 9142. |
Assertion : Two vectors are said to be like vectors if they have same direction but different magnitude. Reason : Vector quantities do not have specific direction. |
| 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. | |
| 9143. |
Ultrasonic waves are those waves [CPMT 1979] |
| A. | To which man can hear |
| B. | Man can't hear |
| C. | Are of high velocity |
| D. | Of high amplitude |
| Answer» C. Are of high velocity | |
| 9144. |
The following phenomenon cannot be observed for sound waves [NCERT 1982; CPMT 1985, 97; AFMC 2002; RPMT 2003] |
| A. | Refraction |
| B. | Interference |
| C. | Diffraction |
| D. | Polarisation |
| Answer» E. | |
| 9145. |
Force of gravity is least at [CPMT 1992] |
| A. | The equator |
| B. | The poles |
| C. | A point in between equator and any pole |
| D. | None of these |
| Answer» B. The poles | |
| 9146. |
Mud houses are cooler in summer and warmer in winter because [BVP 2003] |
| A. | Mud is superconductor of heat |
| B. | Mud is good conductor of heat |
| C. | Mud is bad conductor of heat |
| D. | None of these |
| Answer» D. None of these | |
| 9147. |
Assertion : Anode of Coolidge tube gets heated up at time of emission of X-rays. Reason : The anode of Coolidge tube is made of a material of high melting point. |
| 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. | |
| 9148. |
In an FM system a 7 kHz signal modulates 108 MHz carrier so that frequency deviation is 50 kHz. The carrier swing is |
| A. | 7.143 |
| B. | 8 |
| C. | 0.71 |
| D. | 350 |
| Answer» B. 8 | |
| 9149. |
What is the maximum acceleration of the particle doing the SHM \[y=2\sin \left[ \frac{\pi t}{2}+\varphi \right]\]where 2 is in cm [DCE 2003] |
| A. | \[\frac{\pi }{2}cm/{{s}^{2}}\] |
| B. | \[\frac{{{\pi }^{2}}}{2}cm/{{s}^{2}}\] |
| C. | \[\frac{\pi }{4}cm/{{s}^{2}}\] |
| D. | \[\frac{\pi }{4}cm/{{s}^{2}}\] |
| Answer» C. \[\frac{\pi }{4}cm/{{s}^{2}}\] | |
| 9150. |
Sound waves have the following frequencies that are audible to human beings [CPMT 1975] |
| A. | 5 c/s |
| B. | 27000 c/s |
| C. | 5000 c/s |
| D. | 50,000 c/s |
| Answer» D. 50,000 c/s | |