1291Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open?
Ans : at a place in a valley below sea level
1292Radio telescopes are better than optical telescopes because?
Ans : All of the above
1293Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit?
Ans : visible light
1294Mercury is commonly used as a thermometric fluid rather than water because?
Ans : mercury has greater visibility than water
1295Optical fibre works on the?
Ans : total internal reflection
1296Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in?
Ans : 4.2 years
1297Supersonic plane fly with the speed?
Ans : greater than the speed of sound
1298Mach number is used in connection with the speed of?
Ans : aircraft
1299On a stationary sail boat, air is blown from a fan attached to the boat. The boat?
Ans : does not move
1300Rainbow is due to?
Ans : refraction and reflection of sunlight by water droplets
1301Stars which appear single to the naked eye but are double when seen through a telescope are?
Ans : binaries
1302ML2T-2 is the dimensional formula for?
Ans : couple acting on a body
1303Solar eclipse will take place when?
Ans : the moon is between the sun and the earth
1304Isotopes of an element contain?
Ans : the same number of protons but different number of neutrons
1305One watt-hour is equivalent to?
Ans : 3.6 x 103 J
1306Sir C.V. Raman was awarded Nobel Prize for his work connected with which phenomenon of radiation?
Ans : Scattering
1307Radiocarbon dating technique is used to estimate the age of?
Ans : fossils
1308Large astronomical telescopes always use as objective?
Ans : combinations of lenses
1309One should not connect a number of electrical appliances to the same power socket because?
Ans : this can damage the domestic wiring due to overloading
1310Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this : Diffusion, Refraction, Internal reflection?
Ans : II and III
1311Natural radioactivity was discovered by?
Ans : Henri Becquerel
Ans : non-luminous heavenly bodies
1313One nanometer is equal to?
Ans : 10-9m
1314Mica is used in electrical appliances such as electric iron because mica is?
Ans : a good conductor of heat but a bad conductor of electricity
1315It is easier to roll a barrel full of coal tar than to pull it because?
Ans : the rolling friction is much less than the sliding friction
1316Minimum number of unequal vectors which can give zero resultant are?
Ans : three
1317Intensity of sound has?
Ans : an object existence
1318Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from?
Ans : east
1319An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is?
Ans : 3.33 km
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