NEET TEST SERIES 131 PHYSICS

1. The radii of circular orbits of two satellites A and B of the Earth, are 4R and R, respectively. If the speed of satellite A is 3V, then the speed of satellite B will be:

(a) 3V/4
(b) 6V
(c) 12V
(d) 3V/2

2. A polaroid is placed at 45° to an incoming light of intensity I₀ Now the intensity of light passing through polaroid after polarization would be :

(a) I₀
(b) I₀/ 2
(c) I₀/ 4
(d) Zero

3. If the mass of Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, then which of the following is not correct?

a) Time period of a simple pendulum on the Earth would decrease.
b) Walking on the ground would become more difficult.
c) Raindrops will fall faster.
d) ‘g’ on the Earth will not change.

4. A body of mass m rises to height h = R/5 from the Earth’s surface, where R is Earth’s radius. If g is the acceleration due to gravity at Earth’s surface, the increase in potential energy is:

5. A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be:

(a) 900 Ω

(b) 1800 Ω

(c) 500 Ω

(d) 1000 Ω

6. Three blocks A, B and C, of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is:

(a) 18 N
(b) 2 N
(c) 6 N
(d) 8 N

7. If x longitudinal strain is produced in a wire of Young’s modulus y, then energy stored per unit volume in the material of the wire is:

8. For a series LCR circuit, the power loss at resonance is:

9. If a block moving up an inclined plane inclined at an angle, θ = 30° with a velocity 5m / s stops after 0.5 sec, then μ is:

(a) 0.5
(b) 1.25
(c) 0.6
(d) none of these

10. When air in a capacitor is replaced by a medium of dielectric constant K, the capacity:

(a) Decreases K times
(b) Increases K times
(c) Increases K² times
(d) Remains constant

11. A long solenoid has 1000 turns. When a current of 4 A flows through it, the magnetic flux linked with each turn of the solenoid is 4 ×10^-3 The self-inductance of the solenoid is:

(a) 4 H
(b) 3 H
(c) 2 H
(d) 1 H

12. Potential energy of a satellite having mass ‘m’ and rotating at a height of 6.4 10⁶ m from the Earth centre is:

(a) -0.5mgR_e
(b) -mgR_e
(c) -2mgR_e
(d) 4mgR_e

13. The ionization energy of the electron in the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy levels to emit radiations of 6 wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between

(a) n = 3 and n = 1 states
(b) n = 2 and n = 1 states
(c) n = 4 and n = 3 states
(d) n = 3 and n = 2 states

14. The given electrical network is equivalent to :

(a) AND gate
(b) OR gate
(c) NOR gate
(d) NOT gate

15. A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the direction of magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced emf in the loop when the radius is 2 cm is:

(a) 4.8π μV
(b) 0.8π μV
(c) 1.6π μV
(d) 3.2π μν

16. An astronaut orbiting the Earth in a circular orbit of radius 120 km above the surface of Earth, gently drops a spoon out of his space-ship. The spoon will:

a) fall vertically down to the Earth.
b) move towards the Moon.
c) move along with the space-ship.
d) move in an irregular way then fall down to the Earth.

17. When a body is lifted from surface of the earth to a height equal to the radius of the earth, then the change in its potential energy is

(a) mgR
(b) 2 mgR
(c) 1/2 mgR
(d) 4 mgR

18. A magnet of magnetic moment M and pole strength m is divided in two equal parts, then magnetic moment of each part will be:

19. In the half wave rectifier circuit operating from 50 Hz main frequency, the fundament frequency in the ripple would be

(a) 25Hz
(b) 50 Hz
(c) 70.7 Hz
(d) 100 Hz

20. 70 cal of heat is required to raise the temperature of 2 mol of an ideal gas at constant pressure from C to C The amount of heat required to raise the temperature of the same sample of the gas through the same range of temperature ( C to C) at constant volume will be (gas constant = 2cal / mol )

(a) 30 cal
(b) 50 cal
(c) 60 cal
(d) 80 cal