161. The ancient Greeks said that the four elements were earth, air, water, and fire. In 390 BC, Plato added a fifth element to this list. What was it?
A. Ether
B. Blood
C. Carbon
D. Nitrogen
162. When a bar magnet is cut into two equal halves, the pole strength of each piece?
A. Becomes double
B. Becomes zero
C. Remains the same
D. Becomes Half
163. Which principle states that when a body is partially or thrust equal to the weight of fluid displaced by it?
A. Archimedes
B. Hooke’s
C. Pascal’s
D. Newton’s
164. Speed of sound is maximum in?
A. Gas
B. Liquid
C. Same in all
D. Solid
165. The mass of a body at the center of the earth is?
A. Zero
B. Remains constant
C. More than at the surface
D. Less than at the surface
166. Mercury is used as thermometric material because it has?
A. Less heat capacity
B. Uniform thermal expansion
C. Low freezing point
D. All above properties
167. If the velocity of a body becomes double then its kinetic energy?
A. Remains the same
B. Becomes four times
C. Becomes double
D. Becomes half
168. The number of vectors that can be added by head to tail rule is?
A. 2
B. 3
C. 4
D. Any number
169. 1N is equal to?
A. 1 Kg ms^-2
B. 1 Kg ms
C. 1 Kg m^-1s^-1
D. None of the above
170. Newton’s first law of motion is valid only in the absence of?
A. Force
B. Net Force
C. Friction
D. Momentum
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