Q. The Sun is seen little before is rises and for a short while after it sets. This is because of -
1) total internal reflection
2) atmospheric refraction
3) apparent shift in the direction of Sun
4) dispersion
Q. Which one of the following statements regarding a thermos flask is not correct?
1) The walls of flask are separated by vacuum and made of glass which is a poor conductor of heat
2) The glass walls themselves have shiny surfaces
3) The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner wall
4) The cork supports are poor conductors of heat
Q. Black hole is a -
1) huge black star which has zero acceleration due to gravity on its surface
2) star which has moderate acceleration due to gravity on its surface
3) star which has collapsed into itself and has large acceleration due to gravity on its surface
4) star which has collapsed into itself and has zero acceleration due to gravity on its surface
Q. When a beam of white light passes through a glass prism, the colour of light beam that deviates the least is -
1) Blue
2) Red
3) Green
4) Violet
Q. 1 dyne (a unit of force in CGS system) equals to -
1) 103 g cm/ s2
2) 10-3 g cm/ s2
3) 105 kg m/ s2
4) 10-5 kg m/ s2
Q. Altitude sickness is caused at high altitude due to -
1) High partial pressure of oxygen
2) Low partial pressure of oxygen
3) Low level of haemoglobin
4) High partial pressure of carbon dioxide
Q. Sound waves travel fastest in -
1) Solids
2) liquids
3) gases
4) vacuum
Q. The power of a lens is measured in -
1) dioptre
2) aeon
3) lumen
4) candela
Q. Lightning can even burn a tree because it contains tremendous amount of -
1) heat energy
2) electric energy
3) chemical energy
4) nuclear energy
Q. Red phosphorus is used in the manufacture of safety matches. This is due to the fact that -
1) it shows phosphorescence
2) at ordinary temperature, it is less reactive than other varieties of phosphorus
3) it cannot be converted to white phosphorus on heating
4) it does not react with halogen on heating
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