Q. If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be -
1) R/4
2) R/2
3) R
4) 2R
Q. Which of these waves can be polarised?
1) Sound waves in the air
2) Longitudinal wave on a string
3) Transverse waves on a string
4) Light waves
Q. Which of the following statements about diamond and graphite is true?
1) They have the same crystal structure
2) They have the same degree of hardness
3) They have the same electrical conductivity
4) None of the above
Q. Detect the odd one -
1) Setting of cement
2) Burning of coal
3) Ripening of fruit
4) None of the above
Q. Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he/she is adjusting -
1) amplitude of sound
2) intensity of sound
3) frequency of the sitar string with the frequency of other musical instruments
4) None of the above
Q. A bus is moving along a straight path and takes a sharp turn to the right side suddenly. The passengers sitting in the bus will -
1) fall in the forward direction
2) bent towards the left side
3) bent towards the right side
4) None of the above
Q. Which of the following energy changes involves frictional force?
1) Potential energy to sound energy
2) Chemical energy to heat energy
3) Kinetic energy to heat energy
4) None of the above
Q. Centripetal force is responsible to -
1) keep the body moving along the circular path
2) fly the object along a straight line
3) the independent motion of the object in space
4) None of the above
Q. Which among the following is a positively charged particle emitted by a radioactive element?
1) Beta ray
2) Alpha ray
3) Cathode ray
4) None of the above
Q. A goalkeeper in a game of football pulls his hands backward after holding the ball shot at the goal. This enables the goalkeeper to -
1) exert a large force on the ball
2) increase the force exerted by the ball on the hands
3) decrease the rate of change of momentum
4) None of the above
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