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
Q. The pencil leads are made of mainly -
1) Lithium
2) Charocoal
3) Lead
4) Graphite
Q. Which of the following is a real image?
1) An image formed in a plain mirror
2) An image formed by a diverging lense
3) The image of actors formed on a cinema screen
4) An image formed by a convex mirror
Q. In which of the following metals did the Karddamaka Kshatrapas issue the very rare coins?
1) Copper
2) Silver
3) Potin
4) Gold
Q. A measured temperature in Fahrenheit scale is 2000F. What will be its value in Celsius scale?
1) 93.30C
2) 400C
3) 990C
4) 300C
Q. Ball bearings are used in bicycles, cars, etc., because -
1) the actual area of contact between the wheel and axle is increased
2) the effective area of contact between the wheel and axle is increased
3) the effective area of contact between the wheel and axle is reduced
4) None of the above statements is correct
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