1251. A meteor of mass mentors the earth’s atmosphere at an angle 0 to the horizontal with an initial velocity v. Which of the following is true about vertical component of its velocity ?
A. It remains constant throughout the motion
B. It increases throughout the motion *
C. It decreases throughout the motion
D. None
1252. The K.E of a light and a heavy object is same . Which object has maximum momentum ?
A. Light object
B. Heavy object *
C. Both have the same momentum
D. Data is not sufficient
1253. For the same velocity , the momentum is maximum for :
A. An electron
B. A proton
C. A deuteron
D. An a particle *
1254. The escape velocity of moon in Kms-1 is :
A. 1.23
B. 2.43
C. 2.38 *
D. 2.59
1255. The work done in taking a particle from the floor to a table depends on :
A. The actual path taken
B. The time taken in this work
C. Th speed of the particle
D. The height of the table *
1256. The earth is held in place by the atmosphere by:
A. Winds
B. Gravity *
C. Clouds
D. The rotation of earth
1257. The Escape velocity of Earth in Kms-1:
A. 9.75
B. 11.2 *
C. 12.3
D. 15.6
1258. The initial velocity at which a body rises and never descends is known as:
A. Kinetic energy
B. Terminal velocity
C. Escape velocity *
D. Extreme velocity
1259. The total frictional drag F experienced by a boat traveling through still water at constant speed v is. What is the power developed by the boat ?
A. 0.5 FV
B. FV *
C. 0.5 FV2
D. FV2
1260. A bullet is shot from a rifle. As a result the rifle recoils . The kinetic energy of rifle as compared to that of bullet is :
A. Less *
B. Greater
C. Equal
D. Cannot be concluded