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Home⇒ Everyday Science GK⇒ Physics
Note:- You can add tough questions into your favourite list for second revision. |
Q21 ⇒ Sound travels at the fastest speed in steel [other wrong options] [Discuss in forum] water air vacuum |
Q22 ⇒ Light from the Sun reaches us in nearly 8 minutes [other wrong options] [Discuss in forum] 2 minutes 4 minutes 16 minutes |
Q23 ⇒ Suitable impurities are added to a semiconductor depending on its use. This is done in order to increase its electrical conductivity [other wrong options] [Discuss in forum] increase its life enable it to withstand higher voltages increase its electrical resistivity |
Q24 ⇒ Light travels at the fastest speed in vacuum [other wrong options] [Discuss in forum] glass water hydrogen |
Q25 ⇒ It is easier to roll a stone up a sloping road than to lift it vertical upwards because work done in rolling a stone is less than in lifting it [other wrong options] [Discuss in forum] work done in rolling is more than in lifting work done in lifting the stone is equal to rolling it work done in both is same but the rate of doing work is less in rolling |
Q26 ⇒ Solar eclipse will take place when the moon is between the sun and the earth [other wrong options] [Discuss in forum] the sun is between the moon and the earth the earth is between the moon and the sun the moon does not lie on the line joining the sun and the earth |
Q27 ⇒ Natural radioactivity was discovered by Henri Becquerel [other wrong options] [Discuss in forum] Marie Curie Ernest Rutherfor Enrico Fermi |
Q28 ⇒ Of the following properties of a wave, the one that is independent of the other is its amplitude [other wrong options] [Discuss in forum] velocity wavelength frequency |
Q29 ⇒ Mercury is commonly used as a thermometric fluid rather than water because mercury has greater visibility than water [other wrong options] [Discuss in forum] specific heat of mercury is less than water specific heat of mercury is more than water density of mercury is more than the water |
Q30 ⇒ oil raise up the wick in a lamp. The principle involves capillary action phenomenon [other wrong options] [Discuss in forum] the diffusion of oil through the wick the liquid state of oil volatility of oil |
Q31 ⇒ Pick out the scalar quantity pressure [other wrong options] [Discuss in forum] force velocity acceleration |
Q32 ⇒ Stars twinkle because 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 [other wrong options] [Discuss in forum] the intensity of light emitted by them changes with time the distance of the stars from the earth changes with time the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere |
Q33 ⇒ Railway tracks are banked on curves necessary centripetal force may be obtained from the horizontal component of the weight of the train [other wrong options] [Discuss in forum] necessary centrifugal force may be obtained from the horizontal component weight of the train to avoid frictional force between the tracks and wheels the train may not fly off in the opposite direction |
Q34 ⇒ Planets are non-luminous heavenly bodies [other wrong options] [Discuss in forum] luminous heavenly bodies revolving around a star luminous heavenly bodies that twinkle luminous heavenly bodies that do not twinkle |
Q35 ⇒ Stars appears to move from east to west because the earth rotates from west to east [other wrong options] [Discuss in forum] all stars move from east to west the earth rotates from east to west the background of the stars moves from west to east |
Q36 ⇒ Isotopes of an element contain the same number of protons but different number of neutrons [other wrong options] [Discuss in forum] the same number of neutrons but different number of protons equal number of protons and electrons equal number of nucleons |
Q37 ⇒ Lux is the SI unit of intensity of illumination [other wrong options] [Discuss in forum] luminous efficiency luminous flux luminous intensity |
Q38 ⇒ The absorption of ink by blotting paper involves capillary action phenomenon [other wrong options] [Discuss in forum] viscosity of ink diffusion of ink through the blotting siphon action |
Q39 ⇒ Optical fibre works on the total internal reflection [other wrong options] [Discuss in forum] principle of refraction scattering interference |
Q40 ⇒ Superconductors are substances which offer no resistance to the flow of electricity [other wrong options] [Discuss in forum] conduct electricity at low temperature offer high resistance to the flow of current conduct electricity at high temperatures |
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