NEET TEST SERIES 89 PHYSICS

2. Percentage error in measuring the mass (m) & radius (R) of a solid sphere are 3% & 2% Then error in measurement of moment of inertia about its diameter will be:

a) 5%

b) 7%

c) 4%

d) 8%

 

3. The speed of a projectile at its maximum height is √3/2 times its initial speed. If the range of the projectile is ‘P’ times the maximum height attained by it, P is:

4. A homemade rocket is ejecting 0.05 Kg of gases per second at a velocity of 300 m/s. The thrust force on the rocket is:

a) 20 N

b) 15 N

c) 30 N               

d) none

5. A crane lifts 300 kg weight from earth’s surface up to height of 4 m in 1/12^th The average power generated by it will be: (g = 9.8 m/s)

a) 1965 W
b) 2300 W
c) 4520 W
d) 2352 W

6. Two particles of mass 5 kg and 3 kg are moving along the same straight line with speeds 4 m/s and 5 m/s respectively. The speed of COM of system when particles are moving in opposite directions is V₁ and when particles are moving in same direction is V₂. The ratio V₂ /V₁ is:

a) 1:7
b) 7:1
c) 2:5
d) 5:2

7. In given diagram find out maximum energy stored in spring. Extension in spring is zero initially.


a) 400 J
b) 500 J
c) 300 J
d) 100 J

9. The ratio of the radius of a planet ‘A’ to that of planet ‘B’ is ‘r’. The ratio of acceleration due to gravity on the planets taken in the same order is ‘x’. The ratio of the escape velocities of planet B to that of planet A is:

10. Two spheres of masses m and M are situated in air and the gravitational force between them is F. the space around the masses is now filled with a liquid of specific gravity 3. The gravitational force between bodies will now be:

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

11. By what amount, the energy of a satellite of mass m has to be increased to shift it from an orbit of radius r to orbit of radius 5/3 r ? (Mass of earth is M)

13. A ball is thrown on a horizontal surface in such a way that it initially slides with a speed v₀ without rolling. It gradually picks up rotation motion. Find the speed of the ball at which there will be rolling without slipping–

14. A circular disc has a mass of 1 kg and radius 40 cm. It is rotating about an axis passing through its centre and perpendicular to its plane with a speed of 10 rev/s. The work done in joules in stopping it would be approximately:

a) 56 J

b) 147 J

c) 180 J

d) 158 J

15. The time period of an earth satellite in a circular orbit of radius R is 2 days and its orbital velocity is v₁. If time period of another satellite in a circular orbit is 16 days, then

16. If α, β and γ are coefficient of linear, area and volume expansion respectively, then

a) γ = 3α
b) α = 3γ
c) β = 3α
d) γ = 3β

17. If two rods and  of equal length , and different areas of cross-section A₁ and A₂ have one end each at temperature T₁ and T₂, have equal rates of flow of heat, then

18. Heat is associated with

a) kinetic energy of random motion of molecules
b) kinetic energy of orderly motion of molecules
c) total kinetic energy of random and orderly motion of molecules
d) kinetic energy of random motion in some cases and kinetic energy of orderly motion in other

19. The change in internal energy of a thermodynamical system which has absorbed 2 kcal of heat and done 400 J of work is (1 cal = 4.2 J)

a) 2 kJ

b) 8 kJ

c) 3.5 kJ

d) 5.5 kJ

20. If the amount of heat given to a system is 35 J and the amount of work done on the system is 15 J, then the change in internal energy of the system is

a) –50 J
b) 20 J
c) 30 J
d) 50 J