Q. Which of the following laws deduces the expression for the force between two stationary point charges in vacuum or free space?
1) Lenz's Law
2) Coulomb's Law
3) Gauss' Law
4) Ohm's Law
Q. An iron hammer, Iying in the sun, appears much hotter than its wooden handle because -
1) Iron is at a higher temperature
2) Iron is darker than wood
3) Iron absorbs more heat
4) Iron is a good conductor of heat
Q. A non-electronic conductor is -
1) Iron
2) Gas carbon
3) Copper Sulphate
4) Mercury
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
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