Class/Course  Engineering Entrance
Subject  Physics
Total Number of Question/s  3094
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1. Measurements  Quiz
1. In an experiment the angles are required to be measured using an instrument.29 divisions of the man scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is halfadegree (= 0.5^{0}), then the least count of the instrument is
a) One minute
b) Half minute
c) One degree
d) Half degree
2. Out of the following pairs, which one does not have identical dimensions?
a) Angular momentum and Planck constant
b) Impulse and momentum
c) Moment of inertia and moment of a force
d) Work and torque

2. Kinematics  Quiz
1. A particle has an initial velocity $3\hat{i} + 4\hat{j}$ and an acceleration of $0.4\hat{i} + 0.3\hat{j}$. Its speed after 10 s is
a) 10 unit
b) 7 $\sqrt{2}$ unit
c) 7 unit
d) 8.5 unit
2. If $\vec{A} \times \vec{B}$ = $\vec{B} \times \vec{A}$, then the angle between A and B is
a) π
b) π/3
c) π/2
d) π/4

3. Laws of Motion  Quiz
1. A mass of M kg is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of 45^{0} with the initial vertical direction is
a) Mg (√2 + 1)
b) Mg √2
c) $\frac{Mg}{\sqrt{2}}$
d) Mg(√21)
2. Consider a car moving on a straight road with a speed of 100 ms^{1}. The distance at which car can be stopped, is [μ_{k} = 0.5]
a) 800 m
b) 1000 m
c) 100 m
d) 400 m

4. Work, Energy and Power  Quiz
1. A mass m moves with a velocity v and a collides inelastically with another identical mass. After collision the 1st mass moves with velocity $\frac{v}{\sqrt{3}}$ in a direction perpendicular to the initial direction of motion. Find the speed of the second mass after collision.
a) v
b) √3 v
c) $\frac{2}{\sqrt{3}}v$
d) $\frac{v}{\sqrt{3}}$
2. Statement I when ultraviolet light is incident on a photocell, its stopping potential is V_{0} and the maximum kinetic energy of the photoelectrons is K_{max}. When the ultraviolet light is replaced by Xrays, both V_{0} and K_{max} increase.
Statement II Photoelectrons are emitted with speeds ranging from Zero to a maximum value because of the range of frequencies present in the incident light.
a) Statement I is true, Statement II is true; Statement II is the correct explanation of Statement I.
b) Statement I is true, Statement II is true; Statement II is not the correct explanation of Statement I.
c) Statement I is false, Statement II is true.
d) Statement I is the true, Statement II is false.

5. Rotational Motion  Quiz
1. A body A of mass M while falling vertically downwards under gravity breaks into two parts; a body B of mass $\frac{1}{3}M$ and , body C of mass $\frac{1}{3}m$. The centre of mass of bodies B and C taken together shifts compared to that of body A towards
a) Depends on height of breaking
b) Does not shift
c) Body C
d) Body B
2. A solid sphere, hollow sphere and a ring are released from top of an inclined plane (frictionless) so that they down the plane. The maximum acceleration down the plane is for ( no rolling)
a) Solid sphere
b) Hollow sphere
c) Ring
d) All same

6. Gravitation  Quiz
1. A satellite of mass m revolves around the earth of radius R at a height x from its surface. If g is the acceleration due to gravity on the surface of the earth, the orbital speed of the satellite is
a) gx
b) $\frac{gR}{R  x}$
c) $\frac{gR^{2}}{R + x}$
d) $\left (\frac{gR^{2}}{R + x} \right )^{1/2}$
2. If g is the acceleration due to gravity on the earth surface, the gain in the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth, is
a) 2 mgR
b) $\frac{1}{2}mgR$
c) $\frac{1}{4}mgR$
d) mgR

7. Properties of Solids and Liquids  Quiz
1. If a ball of steel (density ρ = 7.8 g cm^{3}) attains a terminal velocity of 10 cm^{1} when falling in a tank of water (coefficient of viscosity η_{water} = 8.5 x 10^{4} Pa s) then its terminal velocity in glycerine (ρ = 12 g cm^{3} , η = 13.2 Pa s) would be nearly
a) 1.6 x 10^{5} cms^{1}
b) 6.25 x 10^{4} cms^{1}
c) 6.45 x 10^{4} cms^{1}
d) 1.5 x 10^{5} cms^{1}
2. The temperature of the two outer surfaces of composite slab, consisting of two materials having coefficients of thermal conductivity K and 2 K and thickness x and 4x, respectively are T_{2} and T_{1} (T_{2} > T_{1}). The rate of heat tranfer through the slab, in a steady state is $\left (\frac{A\left (T_{2}  T_{1} \right )K}{x} \right )f$ ƒ, with ƒ equals to
a) 1
b) 1/2
c) 2/3
d) 1/3

8. Thermodynamics  Quiz
1. During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio C_{p}/C_{v} for the gas is
a) 4/3
b) 2
c) 5/3
d) 3/2
2. A log metallic bar is carrying heat from one of its end to the order end under steadystate. The variation of temperature θ along the length x of the bar from its hot end is best described by which of the following figure.
a)
b)
c)
d)

9. Kinetic Theory of Gases  Quiz
1. Two rigid boxes containing different ideal gases are placed on a table. Box A contains one mole of nitrogen at temperature T_{0}, while box B contains one mole of helium at temperature (7/3) T_{0}. The boxes are then put into thermal contact with each other, and heat flows between then until the gases reach a common final temperature (Ignore the heat capacity of boxes). Then, the final temperature of the gases, T_{f}, in terms of T_{0} is
a) T_{f} = $\frac{3}{7}T_{0}$
b) $\frac{7}{3}T_{0}$
c) $\frac{3}{2}T_{0}$
d) $\frac{5}{2}T_{0}$
2. A gaseous mixture consists of 16g of helium and 16g of oxygen . The ratio $\frac{C_{p}}{C_{V}}$ of the mixture
a) 1.59
b) 1.62
c) 1.4
d) 1.54

10. Oscillations and Waves  Quiz
1. A wave y=$\alpha sin\left ( \omega tkx \right )$ on a string meets with another wave another wave producing a node at x=0. Then the equation of the unknown wave is
a) y=$\alpha sin\left ( \omega t+kx \right )$
b) y=$\alpha sin\left ( \omega t+kx \right )$
c) y=$\alpha sin\left ( \omega tkx \right )$
d) y=$\alpha sin\left ( \omega tkx \right )$
2. When temperature increases, the frequency of a tuning fork
a) Increases
b) Decreases
c) Remain same
d) Increases or decreases depending on the material

11. Electrostatics  Quiz
1. Let p(r) = $\frac{Q}{\pi R^{4}}r$ be the charge density distribution for a solid sphere of radius R and total charge Q. For a point P inside the sphere at distance r_{1} from the centre of the sphere the magnitude of electric field is
a) zero
b) $\frac{Q}{4\pi \epsilon_{0}r_{1}^{2}}$
c) $\frac{Qr_{1}^{2}}{4\pi \epsilon_{0}R^{4}}$
d) $\frac{Qr_{1}^{2}}{3\pi \epsilon_{0}R^{4}}$
2. A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point P at a distance R/2 from the centre of the shell is
a) $\frac{2Q}{4\pi \epsilon_{0}R}$
b) $\frac{2Q}{4\pi \epsilon_{0}R}$  $\frac{2q}{4\pi \epsilon_{0}R}$
c) $\frac{2Q}{4\pi \epsilon_{0}R}$ + $\frac{q}{4\pi \epsilon_{0}R}$
d) $\frac{\left (q + Q \right )}{4\pi \epsilon_{0}} \frac{2}{R}$

12. Current Electricity  Quiz
1. A rectangular loop has a sliding connector PQ of length l and resistance R Ω and it is moving with a speed v as shown. The setup is placed in a uniform magnetic field going into the plane of the paper. The three currents I_{1}, I_{2} and I are
a) $I_{1}$ = $I_{2}$ = $\frac{Blv}{R}$, I = $\frac{Blv}{R}$
b) $I_{1}$ = $I_{2}$ = $\frac{Blv}{3R}$, I = $\frac{2Blv}{3R}$
c) $I_{1}$ = $I_{2}$ = I = $\frac{Blv}{R}$
d) $I_{1}$ = $I_{2}$ = $\frac{Blv}{6R}$, I = $\frac{Blv}{3R}$
2. If a wire is stretched to make it 0.1% longer, its resistance will
a) increase by 0.2%
b) decrease by 0.2%
c) decrease by 0.05%
d) increase by 0.05%

13. Magnetic Effects of Current and Magnetism  Quiz
1. A charged particle with charge q enters a region of constant, uniform and mutually orthogonal fields $\vec{E}$ and $\vec{B}$ with a velocity $\vec{v}$ perpendicular to both $\vec{E}$ and $\vec{B}$, and comes out without any change in magnitude or direction of $\vec{v}$, Then
a) $\vec{v}$ = $\vec{E} \times \frac{\vec{B}}{B^{2}}$
b) $\vec{v}$ = $\vec{B} \times \frac{\vec{E}}{B^{2}}$
c) $\vec{v}$ = $\vec{E} \times \frac{\vec{B}}{E^{2}}$
d) $\vec{v}$ = $\vec{B} \times \frac{\vec{E}}{E^{2}}$
2. The magnetic lines of force inside a bar magnetic
a) are from northpole to southpole of the magnet
b) do not exist
c) depend upon the area of crosssection of the bar magnet
d) are from southpole to northpole of the magnet

14. Electromagnetic Induction and Alternating Current  Quiz
1. One conducting Utube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed, v then the emf induced in the circuit in terms of B, l and v, where l is the width of each tube, will be
a) Blv
b) Blv
c) zero
d) 2Blv
2. The selfinductance of the motor of an electric fan is 10H, In order to impart maximum power at 50Hz, it should be connected to a capacitance of
a) 4μF
b) 8 μF
c) 1μF
d) 2μF

15. Electromagnetic Waves  Quiz
1. The rms value of the electric field of the light coming from the sum is 720 NC^{1}. The average total energy density of the electromagnetic wave is
a) 4.58 x 10^{6} Jm3
b) 6.37 x 10^{19} Jm^{3}
c) 81.35 x 10^{12} Jm^{3}
d) 3.3 x 10^{3} Jm^{3}
2. Which of the following are not electromagnetic waves?
a) Cosmicrays
b) γrays
c) βrays
d) Xrays

16. Optics  Quiz
1. Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm . Approximately, what is the maximum distance at which these dots can be resolved by the eye ? [Take wavelength of light = 500 nm]
a) 5 m
b) 1 m
c) 6 m
d) 3 m
2. If I_{0} is the intensity of the principal maximum in the single slite diffraction pattern, then what will be its intensity when the slite width is double ?
a) 2I_{0}
b) 4I_{0}
c) I_{0}
d) $\frac{I_{0}}{2}$

17. Dual Nature of Matter and Radiation  Quiz
1. Wave property of electrons implies that they will slow diffraction effects. Davisson and Germer demonstrated this by diffracting effects .Davisson and Germer demonstrated this by diffracting electrons from crystal. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere construtively (see figure)
Electrons accelerated by potential V are diffracted from a crystal . If d = 1Å and I = 30^{0}, V should be about (h = 6.6 x 10^{34} Js, m_{e} = 9.1 x 10^{31} kg, e = 1.6 x 10^{19}C)
a) 2000 V
b) 50V
c) 500V
d) 1000V
2. According to Einsteins photoelectric equation, the plot of the kinetic energy of the emitted photoelectrons from a metal Vs the frequency of the incident radiation gives a straight line whose slope
a) depends on the nature of the metal used
b) depends on the intensity of the radiation
c) depends both on the intensity of the radiation and the metal used
d) is the same for all metals and independent of the intensity of the radiation

18. Atoms and Nuclei  Quiz
1. Starting with a sample of pure $^{66}Cu$, 7/8 of it decays into Zn in 15 min. The corresponding halflife is
a) 10 min
b) 15 min
c) 5 min
d) $7\frac{1}{2}min$
2. The halflife of a radioactive substance is 20min . The approximate the interval (t_{2}  t_{1})between the time t_{2} when
a) 14 min
b) 20 min
c) 28 min
d) 7 min

19. Electronic Devices  Quiz
1. When npn transistor is used as an amplifier
a) electrons move from base to collector
b) holes move from either to base
c) electrons move from collector to base
d) holes move from base to emiiter
2. The combination of gates shown below yields
a) OR gate
b) NOT gate
c) XOR gate
d) NANAD gate

20. Communication Systems  Quiz
1. This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes the two statements.
Statement 1. Sky wave signals are used for long distance radio communication. These signals are in general, less stable than ground wave signals.
Statement 2 The state of ionosphere varies from hour to hour, day to day and season to season.
a) Statement 1 is true, Statement 2 is true, Statement 2 is the correct explanation of Statement 1
b) Statement 1 is true , Statement 2 is true, Statement 2 is not the correct explanations of Statement 1
c) Statement 1 is false, Statement 2 is true
d) Statement 1 is true, Statement 2 is false
2. The logic circuit shown below has the input waveforms A and B as shown. Pick out the correct output wavefrom.
a)
b)
c)
d)