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Home⇒ Everyday Science GK⇒ Physics
Note:- You can add tough questions into your favourite list for second revision. |
Q41 ⇒ One nanometer is equal to 10-9m [other wrong options] [Discuss in forum] 10-6m 10-8m 10-5m |
Q42 ⇒ Rectifiers are used to convert Alternating current to Direct current [other wrong options] [Discuss in forum] Direct current to Alternating current high voltage to low voltage low voltage to high voltage |
Q43 ⇒ It takes much longer to cook food in the hills than in the plains, because 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 [other wrong options] [Discuss in forum] due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking |
Q44 ⇒ On a cold day when a room temperature is 15C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15C, because metals are good conductor of heat [other wrong options] [Discuss in forum] metals have higher thermal capacity than plastics plastics have a lower density than metals plastics have a higher thermal conductivity than metals |
Q45 ⇒ One watt-hour is equivalent to 3.6 x 103 J [other wrong options] [Discuss in forum] 6.3 x 103 J 6.3 x 10-7 J 3.6 x 10-3 J |
Q46 ⇒ Pa(Pascal) is the unit for pressure [other wrong options] [Discuss in forum] thrust frequency conductivity |
Q47 ⇒ On a rainy day, small oil films on water show brilliant colours. This is due to interference [other wrong options] [Discuss in forum] dispersion diffraction polarization |
Q48 ⇒ Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in 4.2 years [other wrong options] [Discuss in forum] 4.2 seconds 42 seconds 42 years |
Q49 ⇒ Mica is used in electrical appliances such as electric iron because mica is a good conductor of heat but a bad conductor of electricity [other wrong options] [Discuss in forum] a bad conductor of heat but a good conductor of electricity a good conductor of heat as well as electricity a bad conductor of heat as well as electricity |
Q50 ⇒ Siphon will fail to work if the level of the liquid in the two vessels are at the same height [other wrong options] [Discuss in forum] the densities of the liquid in the two vessels are equal both its limbs are of unequal length the temperature of the liquids in the two vessels are the same |
Q51 ⇒ It is easier to roll a barrel full of coal tar than to pull it because the rolling friction is much less than the sliding friction [other wrong options] [Discuss in forum] the full weight of the barrel comes into play when it is pulled more surface area of the barrel is in contact with the road when it is pulled coal tar is a liquid and it flows in the barrel when it is rolled |
Q52 ⇒ Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation? Scattering [other wrong options] [Discuss in forum] Diffraction Interference Polarization |
Q53 ⇒ Moment of inertia is tensor [other wrong options] [Discuss in forum] vector scalar phasor |
Q54 ⇒ 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? 3.3 km, 0.30 km [other wrong options] [Discuss in forum] 1.8 km, 0.15 km 2.2 km, 0.20 km 2.8 km, 0.25 km |
Q55 ⇒ out of the following, which is not emitted by radioactive substance? Neutrons [other wrong options] [Discuss in forum] Electrons Electromagnetic radiations Alpha particles |
Q56 ⇒ Supersonic plane fly with the speed greater than the speed of sound [other wrong options] [Discuss in forum] less than the speed of sound of sound of light |
Q57 ⇒ Planets do not twinkle because they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable [other wrong options] [Discuss in forum] they emit light of a constant intensity their distance from the earth does not change with time they are very far away from the earth resulting in decrease in intensity of light |
Q58 ⇒ Point A is at a lower electrical potential than point B. An electron between them on the line joining them will move towards B [other wrong options] [Discuss in forum] move towards A move at right angles to the line joining A and B remain at rest |
Q59 ⇒ Minimum number of unequal vectors which can give zero resultant are three [other wrong options] [Discuss in forum] two four more than four |
Q60 ⇒ Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to both the heating effect of current and hysteresis loss [other wrong options] [Discuss in forum] the heating effect of current alone hysteresis loss alone intense sunlight at noon |
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