NEET TEST SERIES PHYSICS

1. A proton and an α – particle have kinetic energy in the ratio 16:1. The ratio of de Broglie wavelength associated with them is.

(a) 4:1
(b) 2:1
(c) 1:2
(d) 7:2

2. The photoelectric cut off voltage in a certain experiment is 1.5V. What is the maximum kinetic energy of photoelectrons emitted? e=1.6×10⁻¹⁹(c)

(a) 2.4 eV
(b) 1.5 eV
(c) 3.1 eV
(d) 4.5 eV

3. A ray of light when falls on a liquid A-air interface at angle 45°, it just gets total reflection. When a ray of light falls on liquid B -air interface at angle 30°, it does not emerge out. We can infer that

(a) μ_A>μ_B  
(b) μ_A<μ_B
(c) μ_A=μ_B                                   
(d) can’t be inferred

4. In going from a rarer to a denser medium, light loses some spee(d) What happens to energy carried by light waves?

a) Greater in rarer medium
b) Greater in denser medium
c) equal in both mediums
d) cannot be said

5. Two periodic waves of intensities I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is

(a) I₁+I₂
(b) (√I₁+√I₂)²
(c) (√I₁−√I₂)²
(d) 2(I₁+I₂)

6. A rectangular film of liquid is extended from (4cm×2cm) to (5cm×4×cm). If the work done is 3×10⁻⁴J, the value of the surface tension of the liquid is

(a) 0.250Nm⁻¹
(b) 0.125Nm⁻¹
(c) 0.2Nm⁻¹ 
(d) 8.0Nm⁻¹

7. When two displacements represented by y₁=asin (ωt) and y₂=bcos (ωt) are superimposed, the motion is

8. In an SHM, x is the displacement and a is the acceleration at time t. the plot of a against x for one complete oscillation will be

(a) a straight line
(b) a circle
(c) an ellipse
(d) a sinusoidal curve

9. Which of the following statements are true wave motion?

a) Mechanical transverse waves can propagate through all mediums
b) Longitudinal waves can propagate through solids only
c) Mechanical transverse waves can propagate through solids only
d) Longitudinal waves can propagate through vacuum

10. To determine Young’s modulus of the material of a wire,

a) two wires of same length and radius are taken.
b) Single straight wire of uniform cross section is taken.
c) three wires of different lengths but of same material are taken.
d) two springs of same length but different materials are taken.

11. In an electrical circuit, the voltage is measured as V= (200 ± 4) volt and the current is measured as I = (20 ± 0.2) (a) The value of the resistance is:

(a) (10±0.5)Ω
(b) (10±0.3)Ω
(c) (10±0.4)Ω
(d) (10±0.1)Ω

12. A bob is whirled in a horizontal circle by means of a string at an initial speed of 12 rpm. If the tension in the string is quadrupled while keeping the radius constant, the new speed in rad/s is
 
(a) 1.5
(b) 1.8
(c) 2.5
(d) 2.2

13. A wheel of radius 1 meter rolls forward half a revolution on a horizontal groun(d) The magnitude of the displacement of the point of the wheel initially in contact with the ground is

14. If a particle of mass m is moving in a horizontal circle of radius r with a centripetal force F_c=-k/r² , the total energy is

(a) -k/r
(b) k/r
(c) -k/2r
(d) k/2r

16. A 60 kg body is pushed with just enough force to start it moving across a floor and the same force continues to act afterwards. The coefficient of static friction and sliding friction are 0.5 and 0.4 respectively. The acceleration of the body in m/s2 is

(a) 5.2

(b) 2.5

(c) 4.3

(d) 1

17. A body of 10 kg is acted by a force of 129.4 N. If g =8 m/s². The acceleration of the block is 10 m/s². What is the coefficient of kinetic friction?

(a) 0.03 
(b) 0.3
(c) 0.04
(d) 0.4

18. A vehicle of mass m is moving on a rough horizontal road with momentum p. If the coefficient of friction between the tyres and the road be m, then the stopping distance is

19. A man starts walking from a point on the surface of earth (assumed smooth) and reaches diagonally opposite point. The work done in this case is

(a) 0
(b) mgh
(c) -mgh
(d) none

20. The force constants of two springs are k₁ and k₂ respectively. Both are stretched till their potential energies are equal. The forces f₁ and f₂ applied on them are in the ratio