NEET TEST SERIES 111 PHYSICS

1. A projectile is thrown in the upward direction making an angle of 60° with the horizontal direction, with a velocity of 147 ms^-1. Then the lime after which inclination with the horizontal is 45°, is

a) 15 (√3-1) s
b) 15 (√3+1) s
c) 7.5 (√31-1) s
d) 7.5 (√31+1) s

2. An equilateral prism is placed on a horizontal surface. A ray PQ is incident onto it. For minimum deviation

(a) PQ is horizontal
(b) QR is horizontal
(c) RS is horizontal 
(d) any one will be horizontal

3. A tin nucleus (atomic number Z = 50) has a radius of 6.6 * IO-15 m. The potential on its surface will be (the charge on the proton = 1.6 x 10^-19 C)

(a) 1.1 x 10⁷V
(b) 21 x 10⁷V
(c) 3.1 x 10⁷V
(d) 0.15 x 10⁷V

5. A photon collides with a stationary hydrogen atom in ground stale inelastically. Energy of the colliding photon is 10.2 eV. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15 eV. What will be observed by the detector?

(a) 2 photon of energy 10.2 eV
(b) 2 photon of energy 1.4 eV
(c) one photon of energy 10.2 eV and an electron of energy 1.4 eV
(d) one photon of energy 10.2 eV and another photon of 1.4 eV

6. A cylindrical resonance tube, open at both ends, has a fundamental frequency fin air. If half of the length is dipped vertically in water, the fundamental frequency of the air column will be

a) 3 f/2
b) 2 f
c) f
d) f/2

7. What happens to the inductive reactance and the current in a purely inductive circuit if the frequency is halved?

(a) Inductive reactance will be doubled and current will be halved
(b) Both, inducting reactance and current will be doubled
(c) Inductive reactance will be halved and current 11 be doubled
(d) Both, inductive reactance and current will be halved

8. The V-I characteristics shown in figure represents

(a) ohmic conductors
(b) non-ohmic conductors
(c) insulators
(d) superconductors

9. A 2 kg copper block is heated to 500°C and then it is placed on a large block of ice at 0°C. If the specific heat capacity of copper is 400 J/kg°C and latent heat of fusion of water is 3.5×10⁵ J/kg, the amount of ice that can melt is

(a) (7/8) kg
(b) (7/5) kg
(c) (8/7) kg
(d) (5/7) kg

10. A gymnast takes turns with her arms & legs stretched. When she pulls her arms and legs in

(a) the angular velocity decreases
(b) the moment of inertia decreases
(c) the angular velocity stays constant
(d) the angular momentum increases

11. A current of/ampere flows in a wire forming a circular arc of radius r metres subtending an angle 0 at the centre as shown. The magnetic field at the centre O in tesla is

12. The number of degrees of freedom for each atom of a monoatomic gas is

(a) 3
(b) 5
(c) 6
(d) 1

13. The velocity of electromagnetic radiation in a medium of permittivity ε_° and permeability μ_° is given by

14. The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10is

(a) 0.5
(b) 0.8 
(c) 1.0
(d) 0.2 

15. Surface tension of a solution is 30 x 10^-2 N / m . The radius of the soap bubble is 5 cm. The surface energy of soap bubble is

16. A tuning fork A of unknown frequency produces 5 beats/s with a fork of known frequency 340 Hz. When fork A is filed, the beat frequency decreases to 2 beats/s. What is the frequency of fork A?

(a) 335 Hz
(b) 338 Hz
(c) 345 Hz
(d) 342 Hz

17. An electron of a hydrogen like atom, having Z = 4, jumps from 4th energy stale to 2nd energy stale. The energy released in this process, will be: (Given Rch = 13.6 eV) Where R = Rydberg constant, c = Speed of light in vacuum, h = Planck’s constant

(a) 10.5eV
(b) 13.6eV
(c) 3.4eV
(d) 40.8eV

18. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The binding energy per nucleon is practically independent of the atomic number for nuclei of mass number in the range 30 to 170.
Reason R : Nuclear force is short ranged. In the light of the above statements, choose the correct answer from the options given below:

(a) Both A and R are true but R is NOT the correct explanation of A
(b) A is true but R is false
(c) A is false but R is true
(d) Both A and R are true and R is the correct explanation of A

19. An a-particle, a proton and an electron have the same kinetic energy. Which one of the following is correct in case of their De-Broglie wavelength

20. If the length of a wire is made double and radius is halved of its respective values. Then, the Young’s modules of the material of the wire will:

(a) Remains same 
(b) Become 8 times its initial value
(c) Become I/4th of its initial value
(d) Become 4 times its initial value