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1. Which one of the following types of waves are used in a night vision apparatus?

Radio waves Microwaves Infra-red waves None of the above
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2. Who gave the first evidence of the Big- Bang theory?

Edwin Hubble Albert Einstein S. Chandrasekhar Stephen Hawking
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3. Why is it difficult to see through fog?

Rays of light suffer total internal reflection from the fog droplets Rays of light are scattered by the fog droplets Fog droplets absorb light The refractive index of fog is extremely High
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4. Which onr the following is the most effective carrier for communications?

Cables Microwaves Optical fibres Radiowaves
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5. The blue colour of the clear sky is due to

Diffraction of light Dispersion of light Reflection of light Refraction of light
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6. Which one of the following is correct?
A concrete wall generally,

only reflects sound only absorbs sound only transmits sound absorbs and transmits sound
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7. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If both inputs are positive the output is zero. This is

an AND circuit a NOR circuit an OR circuit a high-pass filter
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8. Mist is caused by

Dry ice Ice at low temperature Water vapours at low temperature Carbon- monoxide in solid form
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9. Which colour of heat radiation represents the highest temperature?

Blood red Dark cherry Salmon White
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10. radioactivity is measured by

Geiger-Muller counter Polarimeter Calorimeter Colorimeter
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