Q. Two pieces of metal when immersed in a liquid have equal upthrust on them, then -
1) Both pieces must have equal weights
2) Both pieces must have equal densities
3) Both pieces must have equal volumes
4) Both pieces are floating at the same depth
Q. The amount of heat required for a substance to change from one state to another without change in temperature is called -
1) Convection
2) Specific Heat
3) Radiation
4) Latent Heat
Q. Which of the following is not a radioactive particle?
1) Alpha
2) Delta
3) Beta
4) Gamma
Q. Newton's First law of Motion is also known as -
1) Principle of Inertia
2) Causality Principle
3) Constancy Principle
4) Principle of Relativity
Q. A vector is a physical quantity which has -
1) Mass and volume
2) Density and tension
3) Inertia and stress
4) Magnitude and direction
Q. When the nucleus of uranium is bombarded with neutrons, it breaks up into two of nearly equal mass. This process is called -
1) Radiation
2) Fusion
3) Fission
4) Emission
Q. Two glass lenses of same focal length, one being convex and the other concave, are kept in contact, the combination will act as -
1) convergent lens
2) divergent lens
3) plane glass sheet
4) mirror
Q. The working of LED system is based on which principle?
1) Fluorescence
2) Phosphorescence
3) Electroluminescence
4) None of the above
Q. Which of the following causes more severe bums?
1) Boiling water
2) Hot water
3) Steam
4) Melting iceberg
Q. What is true for RADAR?
1) This is a technique to see hidden objects
2) This is a method to detect fighter planes
3) This is method to send coded message
4) This method is only for night vision
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