NEET TEST SERIES 101 PHYSICS

1. Two slits in Young’s double slit experiment have widths in the ratio 81:1. What is the ratio of amplitudes of light waves coming from them?

a) 3:1
b) 3:2
c) 9:1
d) 6:1

2. The specific charge of a proton is 9.6×107C kg⁻¹. The specific charge of an alpha particle will be

a) 9.6×10⁷C kg⁻¹
b) 19.2×10⁷C kg⁻¹
c) 4.8×10⁷C kg⁻¹
d) 2.4×10⁷C kg⁻¹

3. Light of wavelength λ falls on metal having work functions hc/λ0. Photoelectric effect will take place only if:

a) λ≥λ0
b) λ≤λ0
c) λ≥2λ0
d) λ=4λ0

4. A moving charge produces

a) electric field only
b) magnetic field only
c) both of them
d) none of them.

5. A small angled prism (μ=1.62) gives a deviation of 4.8. Calculate the angle of prism.

a) 5°
b) 6.36°
c) 3°
d) 7.74°

6. A long solenoid of diameter 0.1 m has 2×10⁴turns per meter. At centre of the solenoid is 100 turns coil of radius 0.01 m placed with its axis coinciding with solenoid axis. The current in the solenoid reduces at a constant rate to 0A from 4A in 0.05 s. If the resistance of the coil is 10π²Ω, the total charge flowing through the coil during this time is

a) 32π μC
b) 16 μC
c) 32 μC
d) 16 πμC

7. An inductor 20mH, a capacitor 100μF and a resistor 50Ω are connected in series across a source of emf, V=10sin314t. The power loss in the circuit is

a) 0.67W
b)  0.76W
c) 0.89W
d) 0.51W

8. The potential differences across the resistance, capacitance and inductance are 80V,40V and 100V respectively in an L−C−R circuit. The power factor of this circuit is

a) 0.4
b) 0.5
c) 0.8
d) 1.0

9. Young’s double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly

a) 1.25
b) 1.59
c) 1.69
d) 1.78

10. The refracting angle of a prism is A, and refractive index of the material of the prism is cot (A/2). the angel of minimum deviation is

a) 180°−3A
b) 180°−2A
c) 90°−A            
d) 180°+2A