Top 100 Important Everyday Science Mcqs Set-9

21- Railway tracks are banked on curves so that:

A. The train may move at a higher speed without derailing
B. The necessary centripetal force is provided by the horizontal component of the normal reaction
C. Friction between the wheels and the rails becomes zero
D. The weight of the train decreases

Answer : B. The necessary centripetal force is provided by the horizontal component of the normal reaction

22- The stars twinkle in the night because:

A. They emit light intermittently 
B. The star’s atmosphere absorbs light intermittently 
C. The earth’s atmosphere absorbs light intermittently 
D. The refractive index of the air in atmosphere fluctuates

Answer : D. The refractive index of the air in atmosphere fluctuates

23- Which planet has the most moons?

A. Saturn
B. Jupiter
C. Uranus
D. Neptune

Answer : A. Saturn

24- Small drops of a liquid are spherical in shape because:

A. The surface energy is minimum for the spherical shape
B. The surface energy is maximum for the spherical shape 
C. For a given volume, the surface area of a sphere is maximum 
D. The earth attracts all the particles of the drop equally 

Answer : A. The surface energy is minimum for the spherical shape

25- Oil rises up the wick in a lamp because:

A. Oil is very light 
B. Oil is volatile 
C. Of the capillary action phenomenon
D. Of the surface tension phenomenon

Answer : C. Of the capillary action phenomenon

26- Sun appears reddish during the rising and setting time because:

A. The atmosphere absorbs short wavelengths more than long wavelengths
B. Red light is emitted in huge amount by it 
C. Light of shorter wavelengths are scattered to a greater extent than the longer
D. The atmosphere absorbs long wavelengths more than short wavelengths

Answer : C. Light of shorter wavelengths are scattered to a greater extent than the longer

27- Existence on moon is not possible because of:

A. High pressure 
B. Low pressure 
C. Absence of air
D. Its weak gravitational power

Answer : C. Absence of air

28- Rainbow is produced by tiny raindrops suspended in front of sun rays as a result of:

A. Refraction and dispersion 
B. Reflection and interference 
C. Interference
D. Reflection, refraction and dispersion

Answer : D. Reflection, refraction and dispersion

29- Why is the light of ordinary lamp hotter than the tube light?

A. It is due to incandescence
B. It gives white light 
C. It is due to ionization of gases
D. It has more surface for distribution of energy 

Answer : A. It is due to incandescence

30- The freezer in a refrigerator is fitted near the top:

A. To keep it away from the hot compressor which is near the bottom
B. So that it can cool the whole interior by setting up convection currents
C. For the sake of convenience 
D. None of these

Answer : B. So that it can cool the whole interior by setting up convection currents

31- Why are two blankets warmer than one?

A. Two blankets have more wool and hence provide greater warmth 
B. Two blankets enclose air which does not allow the cold to penetrate
C. Two blankets compress the air in between the body and the blankets and this compression produces heat 
D. None of these

Answer : B. Two blankets enclose air which does not allow the cold to penetrate

32- Water boils at a lower temperature than 100°C on a hill station, because:

A. There is cloud formation at high altitudes 
B. Pressure is lower at high altitudes
C. Temperature is lower at high altitudes 
D. Water vapours are less at high altitudes

Answer : B. Pressure is lower at high altitudes

33- The ink from the fountain pen spills when the pen is carried in an airborne aeroplane, because:

A. The atmospheric pressure is more than that at the sea level 
B. The atmospheric pressure keeps changing rapidly 
C. The atmospheric pressure is less than at the sea level
D. None of these

Answer : C. The atmospheric pressure is less than at the sea level

34- Air is completely removed from an electric bulb to prevent:

A. Bursting of the bulb 
B. Oxidation of tungsten filament
C. Loss of light due to absorption 
D. None of these

Answer : B. Oxidation of tungsten filament

35- Man is able to see both distant and near objects because:

A. The size of the pupil can be adjusted 
B. The lens can change its focal length
C. Lenses are movable 
D. There are different parts in the lens to see distant and nearby objects

Answer : B. The lens can change its focal length

36- Table salt gets moist during rainy seasons because:

A. Sodium chloride is hygroscopic 
B. Sodium chloride is deliquescent 
C. Sodium chloride contains hygroscopic impurities like magnesium chloride
D. Sodium chloride contains a little quantity of sodium iodide

Answer : C. Sodium chloride contains hygroscopic impurities like magnesium chloride

37- The process by which plants release water vapor is called:

A. Transpiration
B. Respiration
C. Condensation
D. Photosynthesis

Answer : A. Transpiration

38- A fresh egg sinks in pure water whereas it floats in saturated salty water. This is because:

A. Of higher density of salty water
B. Of higher density of pure water 
C. Egg shell is made of calcium which is heavier than pure water
D. The fluid matter inside the egg has the same density as the salty water

Answer : A. Of higher density of salty water

39- Four identical kettles, having the same amount of water, have bases made of different metals of same thickness. If these kettles are placed on identical flames, water will boil first in the kettle the base of which is made of:

A. Copper
B. Aluminium
C. Brass
D. Stainless steel 

Answer : A. Copper

40- The setting sun often looks oval in shape because of:

A. Dispersion
B. Optical illusion 
C. Refraction of rays of sun passing through the atmosphere 
D. None of these

Answer : C. Refraction of rays of sun passing through the atmosphere

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