NEET TEST SERIES 132 PHYSICS

2. If the acceleration due to gravity at a height 1 km above the Earth is the same as at a depth d below the surface of Earth, then

(a) d = 2 km
(b) d = 1/2 km
(c) d = 1 km
(d) d = 3/2 km

3. From the following quantities, which one has dimension different from the remaining three?

a) Energy per unit volume
b) Force per unit area
c) Product of voltage and charge per unit volume
d) Angular momentum

4. The coordinates of centre of mass of the following quarter circular arc is:

5. An electric dipole is placed at an angle of 30° deg to a non-uniform electric field. The dipole experiences:

a) a torque as well as a translational force.
b) a torque only.
c) a translational force only in the direction of field.
d) a translational force only in a direction normal to the direction of the field.

6. An aeroplane moves 400 m towards north, 300 m towards west and then 1200 m vertically upwards. Then its displacement from the initial position is

(a) 1300 m
(b) 1400 m
(c) 1500 m
(d) 1600 m

7. If Planck’s constant (h), speed of light in vacuum (c) and Newton’s gravitational constant (G) are the three fundamental constants. Which of the following combina-tions of these has the dimension of length?

8. A small ball of density p is dropped from a height h into a liquid of density σ(σ > ρ) . Neglecting damping forces, the maximum depth to which the body sinks is

9. If charge of 10 C and -2µC are given to two plates of a capacitor are connected across a battery of 12 V, then find the capacitance of the capacitor.

(a) 0.33 µF
(b) 0.5 µF
(c) 0.41 µF
(d) 0.66 µF

10. A ruby laser produces radiations of wavelengths, 662.6 nm in pulses whose durations are 10^-9 If the laser produces 0.39 J of energy per pulse, how many photons are produced in each pulse?

(a) 1.3 × 10⁹
(b) 1.3 × 10¹⁸
(c) 1.3 × 10²⁷
(d) 3.9 × 10¹⁸

11. Two specific heats of a perfect gas are related by:

(a) C_p – C_v=R/J
(b) C_p – C_v=J
(c) Cp – C_v=RJ  
(d) C_p+1/C_v=2.4 cal

12. When a particle is moving in a vertical circle,

a) its radial and tangential acceleration both are constant.
b) its radial and tangential acceleration both are varying.
c) its radial acceleration is constant but tangential acceleration is varying.
d) its radial acceleration is varying but tangential acceleration is constant.

13. The shortest wavelength of the Brackett series of a hydrogen like atom (atomic number = Z) is the same as the shortest wavelength of the Balmar series of hydrogen atom. The value of Z is:

(a) 2
(b) 3       
(c) 4
(d) 6

14. Which of the following is the correct statement about an object immersed in a liquid at rest and left free to move?

a) Buoyancy force is equal to the weight of the object.
b) Centre of buoyancy coincides with the centre of mass of the object.
c) If the density of the object is equal to the density of the liquid then the object moves in the liquid with con-stant velocity.
d) If the object sinks, then the weight of the displaced fluid is less than the force of buoyancy.

15. According to de-Broglie’s hypothesis, particles can be associated with waves. Consider a double slit experiment with mono energetic electrons. Instead of screen, optical detectors are used. If the speed of the electrons is increased,

a) the interference pattern vanishes.
b) the distance between consecutive fringes increases.
c) the distance between consecutive fringes decreases.
d) the interference pattern is unaffected.

16. In stationary waves, antinodes are the points where:

a) minimum displacement and minimum pressure change occur.
b) minimum displacement and maximum pressure change occur.
c) maximum displacement and maximum pressure change occur.
d) maximum displacement and minimum pressure change occur.

17. The angle of incidence of a ray of light at a reflecting surface of an equilateral prism is 50°. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively are (sin 50° = 0.7660)

(a) 40°, 1.5 
(b) 30°, 1.5
(c) 40°, 1.6
(d) 30°, 1.6

18. The displacement of a particle, moving in a straight line, is given by s = 2t² + 2t + 4 where s is in metres and in seconds. The acceleration of the particle is:

(a) 2 m/s²
(b) 4 m/s²
(c) 6 m/s²
(d) 8 m/s²

19. 22 g of CO₂ at 27°C is mixed with 16 g of O₂ at 37°C. The temperature of the mixture is:

(a) 32°C
(b) 27°C
(c) 37°C
(d) 30.5°C

20. Velocity of light in glass whose refractive index with respect to air is 1.5 is 2 × 10⁸ m/s and in certain liquid the velocity of light is found to be 5 × 10⁸ m/s. The refractive index of the liquid with respect to air is

(a) 0.64
(b) 0.80
(c) 1.20
(d) 1.44