Q. Rate of evaporation increases with -
1) an increase of surface area
2) an increase in humidity
3) a decrease in wind speed
4) a decrease of temperature
Q. Magnification is -
1) actual size of specimen/ observed size
2) observed size of specimen/ actual size
3) actual size of specimen - observed size
4) actual size of specimen - observed size
Q. People prefer to wear cotton clothes in summer season. This is due to the fact that cotton clothes are -
1) good absorbers of water
2) good conveyors of heat
3) good radiators of heat
4) good absorbers of heat
Q. Soap solution used for cleaning purpose appears cloudy. This is due to the fact that soap micelles can -
1) refract light
2) scatter light
3) diffract light
4) polarize light
Q. What can be the maximum duration of totality for a solar eclipse?
1) 12.5 minutes
2) 7 minutes 40 seconds
3) 1 hour 42 minutes
4) There is no maximum duration
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