281. Penetrating power of X-Rays increases with?
(A) Decrease in its intensity
(B) Decrease in its velocity
(C) Increase in its velocity
D) Increase in its intensity
282. An electric or magnetic field cannot accelerate?
A) Neutron
(B) Proton
(C) Electron
(D) Alpha Particles
283. If the distance between two charges is doubled, the Coulomb force will become?
(A) Same
(B) Half
(C) Double
D) One Fourth
284. Two parallel wires carrying current in the opposite direction?
(A) Attract each other
B) Repel each other
(C) Do not attract each other
(D) Get rotated perpendicular to each other
285. At resonance, the value of power factor in an LCR series circuit is?
(A) 0
B) 1
(C) 3/2
(D) None of the above
286. A solid cylinder and a hollow cylinder of the same masses and radii are released from an inclined plane; then:
A. Solid cylinder will reach first to the ground
B. Hollow cylinder will reach 1st to the ground
C. The two arrive at the ground simultaneously
D. None
287. A body rotates with a constant angular momentum of 30 J-S for 20 seconds. The force following up on the body is:
A. 1.5 N-m
B. 3 N- m
C. 0 N-m
D. 10 N-m
288. An object weighs 160 N on earth’s surface. The same object will weigh 40 N at a height from the earth’s surface of:
A. R/4
B. 2R
C. R/2
D. R
289. The time period of a Geo-stationary satellite is:
A. 48 Hours
B. 24 Hours
C. 12 Hours
D. 60 Hours
290. The minimum number of satellites that can cover the whole face of the earth is:
A. 2
B. 3
C. 4
D. 5
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