1). Planets are
A). luminous heavenly bodies revolving around a star |
B). non-luminous heavenly bodies |
C). luminous heavenly bodies that twinkle |
D). luminous heavenly bodies that do not twinkle |
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2). Natural radioactivity was discovered by
A). Marie Curie |
B). Ernest Rutherford |
C). Henri Becquerel |
D). Enrico Fermi |
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3). Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this? Diffusion Refraction Internal reflection
A). I, II and III |
B). I and II |
C). II and III |
D). I and III |
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4). One should not connect a number of electrical appliances to the same power socket because
A). this can damage the appliances due to overloading |
B). this can damage the domestic wiring due to overloading |
C). this can damage the electrical meter |
D). the appliance will not get full voltage |
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5). Large astronomical telescopes always use as objective
A). lens |
B). mirror |
C). combinations of lenses |
D). None of the above |
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6). Identify the vector quantity from the following
A). Heat |
B). Angular momentum |
C). Time |
D). Work |
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7). Sound of frequency below 20 Hz is called
A). audio sounds |
B). infrasonic |
C). ultrasonic |
D). supersonics |
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8). RADAR is used for
A). locating submerged submarines |
B). receiving a signals in a radio receiver |
C). locating geostationary satellites |
D). detecting and locating the position of objects such as aeroplanes |
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9). Materials for rain-proof coats and tents owe their water-proof properties to
A). surface tension |
B). viscosity |
C). specific gravity |
D). elasticity |
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10). Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
A). move towards A |
B). move towards B |
C). move at right angles to the line joining A and B |
D). remain at rest |
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