91). A long thread suspended from a fixed point, has a small mass swinging to and fro at its lower end.
| A). The potential energy of the mass is maximum in the middle of the swing. |
| B). The kinetic energy is maximum in the middle of the swing. |
| C). The potential energy is always equal to the kinetic energy. |
| D). The sum of the potential energy and the kinetic energy is maximum in the middle of the swing. |
|
92). Conservation of energy means that
| A). energy can be created as well as destroyed |
| B). energy can be created but not destroyed |
| C). energy cannot be created but can be destroyed |
| D). energy can neither be created nor destroyed |
|
93). A person climbing a hill bends forward in order to
| A). avoid slipping |
| B). increased speed |
| C). reduce fatigue |
| D). increase stability |
|
94). The period of revolution of a geostationary satellite is
| A). 24 hours |
| B). 30 days |
| C). 365 days |
| D). changing continuously |
|
95). If an apple is released from an orbiting spaceship, it will
| A). fall towards the earth |
| B). move along with the spaceship at the same speed |
| C). move at a higher speed |
| D). move at a lower speed |
|
96). The density of sea water increases as
| A). depth and salinity decrease |
| B). depth decreases and salinity increases |
| C). depth increases and salinity decreases |
| D). depth and salinity increase |
|
97). When a ship enters a sea from a river
| A). it rises a little |
| B). it sinks a little |
| C). it remains at the same level |
| D). it rises or sinks depending on the material it is made of |
|
98). A steel ball floats on mercury because
| A). mercury does not allow any metallic ball to sink in it |
| B). mercury is also a metal in the liquid form |
| C). the density of mercury is higher than that of steel |
| D). a steel ball can be made to float on any liquid by suitable adjustment |
|
99). Inside an aeroplane, flying at a high altitude
| A). the pressure is the same as that outside |
| B). normal atmospheric pressure is maintained by the use of air pumps |
| C). the pressure inside is less than the pressure outside |
| D). normal humidity and partial vacuum are maintained |
|
100). Atmospheric pressure is measured with a
| A). hydrometer |
| B). barometer |
| C). hygrometer |
| D). altimeter |
|
