Q. The focal length of the objective lens of a telescope is 50 cm. If the magnification of the telescope is 25, then the focal length of the eye-piece is -
1) 12.5 cm
2) 5 cm
3) 2 cm
4) 10 cm
Q. Light year is a unit of measurement of -
1) very large distances
2) time interval in years
3) amount of light received on earth in a year
4) mass of atoms
Q. Which one of the following forces is non-central and non-conservative?
1) Frictional force
2) Electric force
3) Gravitational force
4) Mechanical force
Q. Which one of the following is an example of Salt-Crystal growth?
1) Chemical weathering
2) Physical weathering
3) Biological weathering
4) Bio-chemical weathering
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
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