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General Science - Questions and Answers

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236. Which of the following types of photons has the highest energy ?
A. Visible radiations
B. Radio waves
C. Gamma rays
D. X-rays
Explanation:
237. Thermos flask keeps a liquid hot because
A. it has double walls.
B. it has silver coated walls.
C. air between the double walls is removed
D. heat losses by conduction and radiation are largely prevented.
Explanation:
238. Without burning paper, water can be boiled in a paper cup because
A. water is a good conductor of heat with high specific heat.
B. paper is a bad conductor of heat
C. ignition temperature of paper is more than boiling point of water.
D. heat capacity of paper is less than that of water.
Explanation:
239. A glass rod placed in a colourless liquid seems to disappear when the
A. liquid wets the flas by capillarity.
B. glass and the liquid have the same refractive index.
C. liquid and the glass have the same colour.
D. glass and the liquid are of the same density.
Explanation:
240. The speed of light will be minimum while passing through
A. glass
B. air
C. water
D. vacuum
Explanation:
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