NEET TEST SERIES 147 PHYSICS

1. The electric potential at a point on the axis of an electric dipole depends on the distance r of the point from the dipole as:

(a) ∝1/r
(b) ∝1/r²
(c) ∝r
(d) ∝1/r³

2. A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of a turns. The magnetic field at the centre of this coil of a turns will be:

(a) nB
(b) n² B
(c) 2nB
(d) 2n² B

3. From the graph between current i and voltage V shown. below, identify the portion corresponding to negative resistance:


(a) DE
(b) CD
(c) BC
(d) AB

4. Workdone in increasing the size of a soap bubble from radius of 3cm to 5cm is nearly (surface tension of soap solution = 0.03Nm ^-1 )

(a) 0.2π mj
(b) 2 π mj
(c) 0.4 π mj
(d) 4 π mj

5. A particle of mass m is moving with a uniform velocity v₁. It is given an impulse such that its velocity becomes v₂ . The impulse is equal to:

6. A certain metallic surface is illuminated with monochromatic light of wavelength, λ. The stopping potential for photoelectric current for this light is 3V₀ . If the same surface is illuminated with light of wavelength 2 λ, the stopping potential is V₀. The threshold wavelength for this surface for photoelectric effect is:

(a) λ / 4
(b) λ / 6
(c) 6λ
(d) 4λ

7. A sound of wavelength λ travelling in a medium with a speed of v m/s enters into another medium where its speed is 2v m/s. Wavelength of the sound wave in the second medium is

(a) λ
(b) λ / 2
(c) 2λ
(d) 4 λ

8. A man is sitting with folded hands on a revolving table. Suddenly, he stretches his arms, Angular speed of the table would:

(a) Increase           
(b) Decrease
(c) Remain the same
(d) Nothing can be said

9. A set of ‘n’ equal resistors, of value ‘R’ each, are connected in series to a battery of emf ‘E’ and internal resistance ‘R’. The current drawn is . Now, the ‘n’ resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 101. The value of ‘n’ is:

(a) 20
(b) 11
(c) 10
(d) 9

10. Water with a mass of 2.0 kg is held at constant volume in a container while 10.0 kJ of energy is slowly added by a flame. The container is not well insulated, and as a result temperature of water?

(a) 0.28℃
(b) 27℃
(c) 0.96℃
(d) 1.27℃

11. Which of the following statements is true about the indicator diagram of adiabatic and isothermal process?

a) The slope of isothermal is more than that of adiabatic.
b) The slope of adiabatic is more than that of isothermal.
c) Both are parallel straight lines.
d) Both are parallel curves

12. Statement I: A car is moving in a horizontal circular plane with varying speed, then the net frictional force is neither pointing towards the radial direction nor along the tangential direction.
Statement II: Components of the frictional force are providing the necessary tangential and centripetal acceleration, in the above situation.

(a) Statement I is true, Statement II is true and Statement II is the correct explanation of Statement I
(b) Statement I is true, Statement II is true, but Statement II is not the correct explanation of Statement 1
(c) Statement I is true, Statement II is false
(d) Statement I is false, Statement II is true

13. Through which character we can distinguish the light waves from sound waves:

(a) Interference
(b) Refraction
(c) Polarization
(d) Reflection

14. In a p-n junction diode, change in temperature due to heating:

a) Does not affect resistance of p-n junction
b) Affects only forward resistance
c) Affects only reverse resistance
d) Affects the overall V-I characteristics of P-N junction

15. A charged pendulum bob is oscillating in a region influenced by the gravitational and electrostatic field. The two fields are anti parallel to each other. The charge on the bob is negative. If the electric field is switched off the time period of small oscillations of the pendulum will:

(a) Increase
(b) Decrease
(c) Remain unchanged
(d) Depends on the magnitudes of the field

16. A light string passing over a smooth light pulley connects two blocks of masses m₁ and m₂ (vertically). If the acceleration of system is g/8 then the ratio of masses is:

(a) 8:1
(b) 9:7
(c) 4:3
(d) 5:3

17. If i₁=3 sin and i₂=4 cos ωt, than i₂ is:


a) 5 sin(ωt+53°)
b) 5 sin(ωt+37°)
c) 5 sin(ωt+45°)
d) 5 cos(ωt+53°)

18. A car of mass 1600 kg negotiates a banked curve of radius 160 m on a frictionless road. If the banking angle is 45° , the speed of the car is:

(a) 45 m/s
(b) 40 m/s
(c) 20 m/s
(d) 80 m/s

19. The speed of a homogenous solid sphere after rolling down an inclined plane of vertical height h from rest without sliding is:

(a) √(10gh/7)
(b) √gh
(c) √(6gh/5)
(d) √(4gh/3)

20. A charge of 40 µC is given to a capacitor having capacitance C = 10μF. The stored energy in ergs is:

(a) 80 × 10^-6
(b) 800
(c) 80
(d) 8000