Top 100 Important Everyday Science Mcqs Set-9

41- Helium is preferred over nitrogen to be mixed with oxygen in cylinders carried by divers because:

A. Helium is inert 
B. Helium is non-poisonous 
C. Nitrogen forms bubbles in the veins and causes pain
D. None of these

Answer : C. Nitrogen forms bubbles in the veins and causes pain

42- The Sun is visible a little before it rises on the horizon and a little after it sets below the horizon. This is a consequence of the phenomenon of:

A. Refraction
B. Total internal reflection 
C. Scattering of sun’s light
D. Dispersion

Answer : A. Refraction

43- One should not connect a number of electric appliances to the same power socket because:

A. The appliances will not get proper current 
B. The appliances will not get full voltage 
C. This can damage the appliances 
D. This can damage the domestic wiring due to overheating

Answer : D. This can damage the domestic wiring due to overheating

44- An ice cube contains an iron ball in it and floats in water contained in a vessel. What will happen if the ice melts away?

A. Water level will go up 
B. Water level will go down
C. Iron ball will sink in the vessel
D. Level of water will not change 

Answer : B. Water level will go down

45- Why does the police use dogs for detective work? Because:

A. They are easily trainable
B. They can run very fast 
C. They can hear ultrasonic waves 
D. They have sharp eye-sight 

Answer : A. They are easily trainable

46- Why does a big fire in the open appear to be fanned by strong winds?

A. Because of the dust particles carried by the wind 
B. Because of constant circulation of winds over and across the fire
C. Because the surrounding heated air rises and cool air rushes in to create a fanning effect
D. None of these

Answer : C. Because the surrounding heated air rises and cool air rushes in to create a fanning effect

47- Why do wet clothes dry more quickly on a warm day?

A. Air can absorb moisture rather quickly
B. Air carries less moisture 
C. High temperature of the air helps fast evaporation
D. All of the above

Answer : C. High temperature of the air helps fast evaporation

48- Television signals cannot be received ordinarily beyond a particular distance due to:

A. Weak antenna 
B. Weakness of signals 
C. Absorption of signals in the air 
D. Curvature of the earth

Answer : D. Curvature of the earth

49- A steel ball floats on mercury because:

A. Mercury is also a metal in the liquid form 
B. The density of mercury is higher than that of steel
C. Mercury does not allow any metal to sink in it 
D. A steel ball can be made to float on any liquid by suitable adjustment

Answer : B. The density of mercury is higher than that of steel

50- Springs of shock absorbers of automobiles and railway coaches are made of steel and not of rubber because steel is:

A. More elastic than rubber
B. Less expensive than rubber 
C. More durable than rubber 
D. Less elastic than rubber 

Answer : A. More elastic than rubber

51- A weather balloon is not fully inflated on the ground because:

A. It cannot rise up in the air when fully inflated 
B. It cannot withstand the outside pressure if fully inflated 
C. If the balloon is fully inflated, it may not remain stable in a storm 
D. The air inside the balloon expands as it rises and may burst

Answer : D. The air inside the balloon expands as it rises and may burst

52- Which type of blood vessel carries blood away from the heart?

A. Vein
B. Artery
C. Capillary
D. Venule

Answer : B. Artery

53- A glass chimney stops an oil lamp from smoking because:

A. The heat produced ensures complete combustion of carbon particles
B. It increases the supply of oxygen to the flame by convection 
C. Both A and B
D. None of these

Answer : C. Both A and B

54- A glass tumbler cracks when very hot water is poured into it because:

A. It is not a strong material 
B. It expands equally from inside and outside 
C. Glass is a bad conductor of heat
D. It does not expand much on heating

Answer : C. Glass is a bad conductor of heat

55- A lighted candle gets extinguished when covered with a tumbler because of:

A. Adequate supply of air 
B. Inadequate supply of air
C. Presence of non-luminous matter
D. None of these

Answer : B. Inadequate supply of air

56- The blue colour of the water in the sea is due to:

A. Absorption of other colours by water molecules 
B. Reflection of the blue light by the impurities in sea water
C. Reflection of blue sky by sea water and scattering of blue light by water molecules
D. None of these

Answer : C. Reflection of blue sky by sea water and scattering of blue light by water molecules

57- Separate lumps of ice freeze into one when strongly pressed together, because:

A. Melting point of ice drops
B. Ice surface has sticking property 
C. Pressure squeezes out the water from ice surface 
D. Pressure reduces the viscosity of water 

Answer : A. Melting point of ice drops

58- Copper wires are generally used for electrical power transmission instead of iron wires because:

A. Copper is a better conductor than iron
B. Copper is cheaper than iron 
C. Copper can take higher power than iron 
D. Copper is lighter than iron

Answer : A. Copper is a better conductor than iron

59- Tungsten is used for the manufacture of an electric bulb because:

A. It is malleable 
B. It is inexpensive
C. It has a very high melting point
D. It is a good conductor

Answer : C. It has a very high melting point

60- A greenish-yellow colour is seen on a boiled egg. This is due to:

A. It has a very high melting point
B. Oxidation of some vitamins in the egg 
C. Formation of some iron compounds
D. None of these 

Answer : C. Formation of some iron compounds

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