## Class/Course - Engineering Entrance

### Subject - Physics

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

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• 1. Measurements - Quiz

1. The respective number of significant figures for the numbers 23.023, 0.0003 and 21 x 10-3 are
a) 5, 1, 2
b) 5, 1, 5
c) 5, 5, 2
d) 4, 4, 2

2. Identify the pair whose dimensions are equal.
a) Torque and work
b) Stress and energy
c) Force and stress
d) Force and work

• 2. Kinematics - Quiz

1. Consider a rubber ball freely falling from a height h= 4.9 m onto a horizontal elastic plate. Assume that the duration of collision is negligible and the collision with the plate is totally elastic. Then the velocity as a function of time the height as function of time will be
a)
b)
c)
d)

2. A car, starting from rest, accelerates at the rate f through a distance s, then continues at constant speed for times t and then decelerates at the rate f/2 to come to rest. If the total distance travelled is 15 s, then
a) s = ft
b) s = $\frac{1}{6}ft^{2}$
c) s = $\frac{1}{2}ft^{2}$
d) s = $\frac{1}{4}ft^{2}$

• 3. Laws of Motion - Quiz

1. A rocket with a lift-off mass 3.5 x 104 kg is blasted upwards with an initial acceleration of 10 ms-1. Then the initial thrust of the blast is
a) 3.5 x 105 N
b) 7.0 x 105 N
c) 14.0 x 105N
d) 1.75 x 105N

2. A block rests on a rough inclined plane making an angle of 300 with the horizontal. The coefficient of static friction between the block and the plane is 0.8. If the frictional force on the block is 10 N, the mass of the block (in kg) is (g = 10 m/s2)
a) 2.0
b) 4.0
c) 1.6
d) 2.5

• 4. Work, Energy and Power - Quiz

1. A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is
a) 0.16 J
b) 1.00 J
c) 0.67 J
d) 0.34 J

2. A bullet fired into a fixed target loses half of its velocity after penetrating 3 cm. How much further it will penetrate before coming to rest, assuming that it faces constant resistance to motion?
a) 3.0 cm
b) 2.0 cm
c) 1.5 cm
d) 1.0 cm

• 5. Rotational Motion - Quiz

1. A circular disc of radius R is removed from a bigger circular disc of radius 2 R, such that the circumference of the disc coincide. The centre of mass of the nerw disc is $\frac{\alpha}{R}$ from the centre of the biggerdisc. The value of α is
a) $\frac{1}{3}$
b) $\frac{1}{2}$
c) $\frac{1}{6}$
d) $\frac{1}{4}$

2. Moment of interia of a circular wire of mass M and radius R about its diameter is
a) $\frac{MR^{2}}{2}$
b) MR2
c) 2MR2
d) $\frac{MR^{2}}{4}$

• 6. Gravitation - Quiz

1. A planet in a distant solar system is 10 times more massive than the earth and its radius is 10 times smaller. Given that the escape velocity from the earth is 11 kms-1, the escape velocity from the surface of the planet would be
a) 1.1 km s-1
b) 11 km s-1
c) 110 km s-1
d) 0.11 km s-1

2. The kinetic energy needed to project a body of mass m from the earth surface (radius R) to infinity is
a) $\frac{mgR}{2}$
b) 2mgR
c) mgR
d) $\frac{mgR}{4}$

• 7. Properties of Solids and Liquids - Quiz

1. A spherical solid ball of volume V is made of a material of density ρ1. It is falling through a liquid of density ρ22 < ρ1). [Assume that the liquid applies a viscous force on ball that is proportional to the square of its speed v, ie, Fvisvous = -kv2(K > 0)]. The terminal speed of the ball is
a) $\sqrt{\frac{Vg\left (\rho_{1} - \rho_{2} \right )}{k}}$
b) $\frac{Vg\rho_{1}}{k}$
c) $\sqrt{\frac{Vg\rho_{1}}{k}}$
d) $\frac{Vg\left (\rho_{1} - \rho_{2} \right )}{k}$

2. Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will
a) Increases
b) Decreases
c) Remain same
d) Decreases for same, while increases for others

• 8. Thermodynamics - Quiz

1. A container with insulating walls is divided into two equal parts by a partition fitted with a valve. One part is filled with an ideal gas at a pressure p and temperature T, whereas the other part is completely evacuated. If the valve is suddenly opened, the pressure and temperature of the gas will be
a) $\frac{p}{2}$, T
b) $\frac{p}{2}$, $\frac{T}{2}$
c) p, T
d) p , $\frac{T}{2}$

2. A thermally insulated vessel contains an ideal gas of molecular mass M and ration of specific heats ϒ. It is moving with speed v and its suddebly brought to rest. Assuming no heat is lost to the surroundings, its temperature increases by
a) $\frac{\left (\gamma - 1 \right )}{2\gamma R}Mv^{2}K$
b) $\frac{\gamma Mv^{2}}{2R}K$
c) $\frac{\left (\gamma - 1 \right )}{2 R}Mv^{2}K$
d) $\frac{\left (\gamma - 1 \right )}{2\left (\gamma + 1 \right )R} Mv^{2}K$

• 9. Kinetic Theory of Gases - Quiz

1. At what temperature is the rms velocity of a hydrogen molecule equal to that of an oxygen molecule at 470C?
a) 80K
b) -73K
c) 3K
d) 20K

2. If Cp and Cv denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then
a) Cp - CV = $\frac{R}{28}$
b) Cp - CV = $\frac{R}{14}$
c) Cp - CV = R
d) Cp - CV = 28R

• 10. Oscillations and Waves - Quiz

1. A particle of mass m executes simple harmonic motion with amplitude $\alpha$ and frequencies v. The average kinetic energy during its motion from the position of equilibrium to the end is
a) $\pi^{2}m\alpha^{2}v^{2}$
b) $\frac{1}{4}m\alpha^{2}v^{2}$
c) $4\pi^{2}m\alpha^{2}v^{2}$
d) $2\pi^{2}m\alpha^{2}v^{2}$

2. A wave travelling along the x-axis is described by the equation y(x,t)=$0.005cos\left ( \alpha x-\beta t \right )$. if the wavelength and the time period of the wave are 0.08m and 2.0s, respectively, then $\alpha$ and $\beta$ in appropriate units are
a) $\alpha$= $25.00\pi$, $\beta$=$\pi$
b) $\alpha$= $\frac{0.08}{\pi}$, $\beta$=$\frac{2.0}{\pi}$
c) $\alpha$= $\frac{0.08}{\pi}$, $\beta$=$\frac{2.0}{\pi}$
d) $\alpha$= $12.50\pi$, $\beta$=$\frac{\pi}{2.0}$

• 11. Electrostatics - Quiz

1. The potential at a point x (measured in μm) due to some charges situated on the x-axis is given by V(x) = 20/(x2 - 4) volt.
The electric field E at x = 4 μm is given by
a) $\frac{5}{3}V/\mu m$ and in the -ve x direction
b) $\frac{5}{3}V/\mu m$ and in the +ve x direction
c) $\frac{10}{9}V/\mu m$ and in the -ve x direction
d) $\frac{10}{9}V/\mu m$ and in the +ve x direction

2. On moving a charge of 20 C by 2 cm, 2J of work is done, then the potential difference between the points is
a) 0.1 V
b) 8V
c) 2V
d) 0.5V

• 12. Current Electricity - Quiz

1. The resistance of the series combination of two resistances is S. When they are joined in parallel, the total resistance is P. If S = np, then the minimum possible value of n is
a) 4
b) 3
c) 2
d) 1

2. The thermistors are usually made of
a) metals with low temperature coefficient of resistivity
b) metals with high temperature coefficients of resistivity
c) metals oxides with high temperature coefficient of resistivity
d) semiconducting materials having low temperature coefficient of resistivity

• 13. Magnetic Effects of Current and Magnetism - Quiz

1. Two concentric coils each of radius equal to 2π cm are placed at right angles to each other. 3A and 4A are the currents flowing in each coil respectively. The magnetic induction in Wb/m2 at the centre of the coils will be
0 = 4π x 10-7 Wb/Am)
a) 12 x 10-5
b) 10-5
c) 5 x 10-5
d) 7 x 10-5

2. A long straight wire of radius a carries a steady current I. the current is uniformly distributed across its cross-section. The ratio of the magnetic field at $\frac{a}{2}$ and 2a is
a) 1/4
b) 4
c) 1
d) 1/2

• 14. Electromagnetic Induction and Alternating Current - Quiz

1. If a current is passed through a spring then the spring will
a) expand
b) compress
c) remain same
d) None of the above

2. The power factor of an AC circuit having resistance R and inductance L (connected in series) and an angular velocity ω is
a) $\frac{R}{\omega L}$
b) $\frac{R}{\left (R^{2} + \omega^{2}L^{2} \right )^{1/2}}$
c) $\frac{\omega L}{R}$
d) $\frac{R}{\left (R^{2} - \omega^{2}L^{2} \right )^{1/2}}$

• 15. Electromagnetic Waves - Quiz

1. Which of the following are not electromagnetic waves?
a) Cosmic-rays
b) γ-rays
c) β-rays
d) X-rays

2. 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 Jm-3
b) 6.37 x 10-19 Jm-3
c) 81.35 x 10-12 Jm-3
d) 3.3 x 10-3 Jm-3

• 16. Optics - Quiz

1. The speed of light in the medium is
a) minimum on the axis of the beam
b) the same everywhere in the beam
c) directly proportional to the intensity I
d) maximum on the axis of the beam

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. The time taken by a photoelectron to come out after the photon strikes is approximately
a) 10-4 s
b) 10-10 s
c) 10-16 s
d) 10-1 s

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. The wavelength involved in the spectrum, of deutrium are slightly different from that of hydrogen spectrum, because
a) sizes of the two nuclei are different
b) nuclear forces are different in the two cases
c) masses of the two nuclei are different
d) attraction between the electron and the nucleus is different in the two cases

2. Statement I A nucleus having having energy E1 decays be β- emission to daughter nucleus having energy E2, but the β- rays are emitted with a continuous energy spectrum having end point energy E1 - E2.
Statement II To conserve energy and momentum in β-decay at least three particles must take part in the transformation.
a) Statement I is false, Statement II is true
b) Statement I is true, Statement II is true
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 the correct explanation of Statement I

• 19. Electronic Devices - Quiz

1. Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?
a) The number of free conduction electrons is significant in C but small in Si and Ge.
b) The number of free conduction electrons is negligibly small in all the three
c) The number of free electrons for condution is significant in all the three.
d) The numbe of free electrons for conduction is significant only in Si and Ge but small is C.

2. The energy band gap is maximum in
a) metals
b) superconductors
c) insulators
d) semiconductors

• 20. Communication Systems - Quiz

1. Which of the following four alternatives is not correct?
a) to increase the sensitivity
b) to reduce the time lag between transmission and reception of the information signal
c) to reduce the size of antenna
d) to reduce the fractional band width, that is the ratio of the signal band width to the centre frequency

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)