## Class/Course - Engineering Entrance

### Subject - Physics

#### Total Number of Question/s - 3094

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• 1. Measurements - Quiz

1. A body of mass m= 3.513 kg is moving along the x-axis with a speed of 5.00 ms-1. The magnitude of its momentum is recorded as
a) 17.6 kg ms-1
b) 17.565 kg ms-1
c) 17.56 kg ms-1
d) 17.57 kg ms-1

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. The relation between time t and distance x is t = ax2 + bx, where a and b are constants. The acceleration is
a) -2 abv2
b) 2 bv3
c) - 2av3
d) 2 av2

2. From a building two balls A and B are thrown such that A is thrown upwards and B downwards (both vertically). If vA and vB are their respective velocities on reaching the ground, then
a) vB > vA
b) vA = vB
c) vA > vB
d) Their velocities depend on their mases

• 3. Laws of Motion - Quiz

1. Consider the following two statements :
A. Linear momentum of a system of particles is zero.
B. Kinetic energy of a system of particles is zero
Then
a) A does not imply B and B does not imply A
b) A implies B but B does not imply A
c) A does not imply B but B implies A
d) A implies B and B implies A

2. A block is kept on a frictionless inclined surface with angle of inclination α. The incline is given an acceleration a to keep the block stationary. Then a is equal to

a) $\frac{g}{tan\alpha }$
b) g cosec θ
c) g
d) g tan θ

• 4. Work, Energy and Power - Quiz

1. The block of mass M moving on the frictionless horizontal surface collides with the spring of spring constant k and compresses it by length L. The maximum momentum of the block after collision is

a) $\sqrt{MkL}$
b) $\frac{kL^{2}}{2M}$
c) Zero
d) $\frac{ML^{2}}{k}$

2. A spring of spring constant 5 x 103 N/m is stretched initially by 5 cm from the unstretched it position. Then the work required to stretch it further by another 5 cm is
a) 12.50 N-m
b) 18.75 N-m
c) 25.00 N-m
d) 6.25 N-m

• 5. Rotational Motion - Quiz

1. A particle of mass m moves along line PC with velocity v as shown. What is the angular momentum of the particle about O?

a) mvL
b) mvl
c) mvr
d) zero

2. A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is
a) $\frac{L}{4}$
b) 2 L
c) 4 L
d) $\frac{L}{2}$

• 6. Gravitation - Quiz

1. The time period of a satellite of earth is 5 h. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become
a) 10 h
b) 80 h
c) 40 h
d) 20 h

2. The time period of an earth satellite in circular orbit is independent of
a) The mass of the satellite
c) Both the mass and radius of the orbit
d) Neither the mass of the satellite nor the radius of its orbit

• 7. Properties of Solids and Liquids - Quiz

1. Heat given to a body which raises its temperature by 10 C is
a) Water equivalent
b) Thermal capacity
c) Specific heat

2. If the temperature of the sun were to increases from T to 2T and its radius from R to 2R , then the ratio of the radiant energy received on earth to what it was previously, will be
a) 4
b) 16
c) 32
d) 64

• 8. Thermodynamics - Quiz

1. Heat cannot be itself flow from a body at lower temperature to a body a higher temperature is a statement or consequence of
a) Second law of thermodynamics
b) Conservation of momentum
c) Conservation of mass
d) First law of thermodynamics

2. The work done on the gas in taking it from D to A is
a) -414 R
b) + 414 R
c) - 690 R
d) + 690 R

• 9. Kinetic Theory of Gases - Quiz

1. One kg of a diatomic gas is at a pressure of 8 × 10-4 Nm-2 . The density of the gas is 4 kgm-3. What is the energy of the gas due to its thermal motion?
a) 3 × 104 J
b) 5 × 104 J
c) 6 × 104 J
d) 7 × 104 J

2. One mole of ideal monoatomic gas $\left ( \gamma = \frac{5}{3} \right )$ is mixed with one mole of diatomic gas $\left ( \gamma = \frac{7}{5} \right )$. What is γ for the mixture ? γ denotes the ratio of specific heat at constant pressure, to that at constant volume
a) $\frac{3}{2}$
b) $\frac{23}{15}$
c) $\frac{35}{23}$
d) $\frac{4}{3}$

• 10. Oscillations and Waves - Quiz

1. Two simple hgarmonic motions are represented by the equation y1 = 0.1 sin$(100\pi+ \frac{\pi}{3})$ and y2= 0.1 cos $\pi$t. The phase differnce of the velocity of particle 1, with respect to the velocity of particle 2 is
a) $\frac{-\pi}{6}$
b) $\frac{\pi}{3}$
c) $\frac{-\pi}{3}$
d) $\frac{\pi}{6}$

2. A particle at the end of a spring executes simple harmonic motion with a period t1, while the corresponding period for another spring is t2. If the period of oscillation with the two springs in series is T, then
a) T = t1 + t2
b) $T^{2} = t_{1}^{2} + t_{2}^{2}$
c) $T^{-1}$ = $t_{1}^{-1} + t_{2}^{-1}$
d) $T^{-2}$ = $t_{1}^{-2} + t_{2}^{-2}$

• 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 r1 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. Two identical charged spheres suspended from a common point by two massless strings of length l are initially a distance d(d < <1) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result charges approach each other with a velocity v. Then as a function of distance x between them,
a) v ∝ x-1
b) v ∝ x1/2
c) v ∝ x
d) v ∝ x-1/2

• 12. Current Electricity - Quiz

1. The resistance of a bulb filament is 100Ω at a temperature of 1000C. If its temperature coefficient of resistance be 0.005 per0C, its rtesistance will become 200Ω at a temperature of
a) 300C
b) 4000C
c) 5000C
d) 2000C

2. This question contains Statement I and
Statement-II . Of the four choices given after the statements, choose the one that best describes the two statements.
Statement I : The temperature dependence of resistance is usually given as R = R0(1 + αΔt). The resistance of a wire changes from 100Ω to 150Ω when its temperature is increased from 270C to 2270C. This implies that α = 2.5 x 10-3/0C.
Statement II : R = Ri(1 + αΔT) is valid only when the change in the temperature ΔT is small and ΔR = (R - R0) << R0.
a) Statement I is true, Statement II is false.
b) Statement I is true, Statement II is true; Statement II is the correct explanation of Statement I.
c) Statement I is true, Statement II is true; Statement II is not the correct explanation of Statement I.
d) Statement I is false, Statement II is true.

• 13. Magnetic Effects of Current and Magnetism - Quiz

1. A charged particle moves through a magnetic field perpendicular to its direction. Then
a) the momentum changes but the kinetic energy is constant
b) both momentum and kinetic energy of the particle are not constant
c) both momentum and kinetic energy of the particle are constant
d) kinetic energy changes but the momentum is constant

2. The magnitude of the magnetic field (B) due to loop ABCD at the origin (O) is
a) zero
b) $\frac{\mu_{0}\left (b - a \right )}{24ab}$
c) $\frac{\mu_{0}I}{4\pi} \left [\frac{b - a}{ab} \right ]$
d) $\frac{\mu_{0}I}{4\pi}\left [2\left (b - a \right ) + \frac{\pi}{3}\left (a + b \right ) \right ]$

• 14. Electromagnetic Induction and Alternating Current - Quiz

1. In a transformer, number of turns in the primary are 140 and that in the secondary are 280. If current in primary is 4A, then that in the secondary is
a) 04:00 am
b) 02:00 am
c) 06:00 am
d) 10:00 am

2. In a series resonant LCR circuit , the voltage across is 100V and R = 1kΩ with C = 2μF. The resonant frequency ω is 200rad/s. At resonance frequency ω is 200 rad/s. At resonance the voltage across L is
a) 2.5 x 10-2 V
b) 40 V
c) 250V
d) 4 x 10-3V

• 15. Electromagnetic Waves - Quiz

1. A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is
a) $\frac{E}{c}$
b) $\frac{2E}{c}$
c) Ec
d) $\frac{E}{c^{2}}$

2. Which of the following radiations has the least wavelength?
a) γ-rays
b) β-rays
c) α-rays
d) X-rays

• 16. Optics - Quiz

1. An astronomical telescope has a large aperture to
a) reduce spherical aberration
b) have high resolution
c) increase span of observation
d) have low dispersion

2. Statement I On viewing the clear blue portion of the sky through a Calcite crystal, the intensity of transmitted light varies as the crystal is rotated . Statement II The light coming from the sky is polarized due to scattering of sun light by particles in the atmosphere. The scattering is largest for blue light.
a) Statement I is false, Statement II is true
b) Statement I is true, Statement II is false
c) Statement I is true, Statement II is true, Statement II is the correct explanation of statement I
d) Statement I is true, Statement II is true; Statement II is not correct explanation of statement I

• 17. Dual Nature of Matter and Radiation - Quiz

1. A photocell is illuminated by a small bright source placed 1 m away . When the same source of light is placed $\frac{1}{2}$ away, the number of electrons emitted by photocathode would
a) decrease by a factor of 4
b) increase by a factor of 4
c) decrease by a factor of 2
d) increase by a factor of 2

2. The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV and the stopping potential for a radiation incident on this surface is 5V. The incident radiation lies in
a) Ultra-violet region
b) infra-red region
c) visible region
d) X-ray region

• 18. Atoms and Nuclei - Quiz

1. Which of the following cannot be emitted by radioactive substances during their decay?
a) Protons
b) Neutrons
c) Helium nuclei
d) Electrons

2. b) d)
19. Electronic Devices - Quiz

1. The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm, is incident on it. The band in (eV) for the semiconductor is
a) 1.1 eV
b) 2.5 eV
c) 0.5 eV
d) 0.7 eV

2. When p-n junction diode is forward biased, then
a) the depletion region is reduced and barrier height is increased
b) the depletion region is widened and barrier height is increased
c) both the depletion region and barrier height are reduced
d) both the depletion region and barrier height are increased

• 20. Communication Systems - Quiz

1. Consider telecommunication through optical fibres. Which of the following statements is not true?
a) Optical fibres can be graded refractive index
b) Optical fibres are subjected to electromagnetic interference from outside
c) Optical fibres have extremely low transmission loss
d) Optical fibres may have homogeneous core with a suitable cladding

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)