Q. Which one of the following is not the unit of energy?
1) Joule
2) Watt-hr
3) Newton-metre
4) kg-metre/sec2
Q. Two planets orbit the Sun in circular orbits, with their radius of orbit as R1 = R and R
1) 1/ 16
2) 1/ 8
3) 1/ 4
4) 1/ 2
Q. A metallic wire having resistance of 20 Ω is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to -
1) 20 Ω
2) 10 Ω
3) 5 Ω
4) 15 Ω
Q. Light of uniform intensity impinges perpendicularly on a totally reflecting surface. If the area of the surface is halved, the radiation force on it will become -
1) double
2) half
3) four times
4) one fourth
Q. Which one of the following statements about sound is not correct?
1) Sound travels at a speed slower than the speed of light
2) Sound waves are transverse waves
3) Sound waves are longitudinal waves
4) Sound travels faster in moist air than in dry air
Q. When the short circuit condition occurs, the current in the circuit -
1) becomes zero
2) remains constant
3) increases substantially
4) keeps on changing randomly
Q. Which of the following statements is not correct regarding the travel of sound waves?
1) Sound waves can travel through water
2) Sound waves can travel through air
3) Sound waves can travel through steel
4) Sound waves can travel through vacuum
Q. Which of these devices is used to increase the power of a signal?
1) Amplifier
2) Voltage regulator
3) Attenuator
4) All of the above
Q. Sound velocity is usually larger in solids than in liquids and gases because -
1) solids are more elastic than liquids and gases
2) solids are less elastic than liquids and gases
3) volumetric expansion coefficients of liquids and gases are higher than solids
4) frequency of sound waves decreases in solids due to Doppler shift
Q. A container is filled with water at 40C. The water will overflow if the temperature of water is -
1) Increased
2) Decreased
3) Increased or decreased
4) None of the above
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