Physics (Objective) (Pages :44)

  • 1261 Let a thin capillary tube be replaced with another tube of insufficient length then, we find water?

    Ans : will not rise
  • 1262 If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same?

    Ans : momentum
  • 1263 Pick out the scalar quantity?

    Ans : pressure
  • 1264 Rectifiers are used to convert?

    Ans : Alternating current to Direct current
  • 1265 Sound waves in air are?

    Ans : longitudinal
  • 1266 Magnetism at the centre of a bar magnet is?

    Ans : zero
  • 1267 It is more difficult to walk on a sandy road than on a concrete road because?

    Ans : the friction between sand and feet is less than that between concrete and feet
  • 1268 Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2?

    Ans : 14 m/s
  • 1269 Lux is the SI unit of?

    Ans : intensity of illumination
  • 1270 On a rainy day, small oil films on water show brilliant colours. This is due to?

    Ans : interference
  • 1271 Point A is at a lower electrical potential than point B. An electron between them on the line joining them will?

    Ans : move towards B
  • 1272 Materials for rain-proof coats and tents owe their water-proof properties to?

    Ans : surface tension
  • 1273 RADAR is used for?

    Ans : detecting and locating the position of objects such as aeroplanes
  • 1274 Sound of frequency below 20 Hz is called?

    Ans : infrasonic
  • 1275 On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because?

    Ans : cohesion of mercury is greater than its adhesion with glass
  • 1276 Suitable impurities are added to a semiconductor depending on its use. This is done in order to?

    Ans : increase its electrical conductivity
  • 1277 Stars twinkle because?

    Ans : the refractive index of the different layers of the earth's atmosphere changes continuously; consequently the position of the image of a start changes with time
  • 1278 It takes much longer to cook food in the hills than in the plains, because?

    Ans : in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
  • 1279 Moment of inertia is?

    Ans : tensor
  • 1280 Inside an aeroplane, flying at a high altitude,?

    Ans : normal atmospheric pressure is maintained by the use of air pumps
  • 1281 Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

    Ans : Air; water and iron
  • 1282 One thousand microns is equal to?

    Ans : 10-3m
  • 1283 Sound travels at the fastest speed in?

    Ans : steel
  • 1284 oil raise up the wick in a lamp. The principle involves?

    Ans : capillary action phenomenon
  • 1285 Superconductors are substances which?

    Ans : offer no resistance to the flow of electricity
  • 1286 Light travels at the fastest speed in?

    Ans : vacuum
  • 1287 Railway tracks are banked on curves?

    Ans : necessary centripetal force may be obtained from the horizontal component of the weight of the train
  • 1288 On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because?

    Ans : metals are good conductor of heat
  • 1289 Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

    Ans : 3.3 km; 0.30 km
  • 1290 Intensity of sound at a point is ____ its distance from the source.?

    Ans : inversely proportional to square of

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