Top 100 Important Everyday Science Mcqs Set-9

1- When water is heated from 0°C to 10°C, the volume of water:

A. Increases steadily 
B. Decreases steadily 
C. First increases then decreases 
D. First decreases then increases

Answer : D. First decreases then increases

2- When a person enters a dark room from bright light, he cannot see anything clearly for some time. Slowly, he starts seeing things. This is because:

A. The length of lens increases 
B. The iris expands
C. The iris contracts 
D. The distance between the lens and retina increases

Answer : B. The iris expands

3- By opening the door of a refrigerator which is inside the room:

A. You can cool it to the temperature inside the refrigerator
B. You can cool the room to a certain degree 
C. You can warm the room
D. None of these 

Answer : C. You can warm the room

4- Ball bearings are used in a vehicle to:

A. Reduce friction
B. Increase friction 
C. Make the wheel stable 
D. None of these

Answer : A. Reduce friction

5- The water in the central region and on the surface in streams flows with higher speed compared to the other regions in the flow. The property of water responsible to resist this effect is:

A. Viscosity
B. High density 
C. Surface tension 
D. Compressibility

Answer : A. Viscosity

6- In summer, a cloudy night is hotter than a starlit night because:

A. Clouds work as a thick blanket and produce heat 
B. Clouds do not allow cold air to reach earth 
C. Clouds prevent the heat radiated by the earth from escaping to the sky
D. Heat is generated by clouds and radiated back to earth

Answer : C. Clouds prevent the heat radiated by the earth from escaping to the sky

7- The SI unit of force is:

A. Joule
B. Pascal
C. Newton
D. Watt

Answer : C. Newton

8- A ship floats on water. This can be explained by:

A. Boyle’s law 
B. Newton’s law of motion 
C. Raman effect 
D. Archimedes principle

Answer : D. Archimedes principle

9- Food remains unspoilt in a refrigerator for a longer time because:

A. The antibiotics inside a refrigerator kill bacteria and fungus 
B. The low temperature inside makes the food shrink and thereby crush the germs
C. Bacteria and fungus cannot multiply fast at sufficiently low temperatures
D. Refrigerator contains food preservatives that get activated at low temperatures

Answer : C. Bacteria and fungus cannot multiply fast at sufficiently low temperatures

10- A glass rod placed in a colourless liquid seems to disappear when the:

A. Glass and the liquid have the same density
B. Liquid and the glass have the same colour 
C. Glass and the liquid have the same refractive index
D. Liquid wets the glass by capillarity

Answer : C. Glass and the liquid have the same refractive index

11- Burns caused by steam are much more severe than those caused by boiling water as:

A. Steam is a gas and engulfs the body quickly 
B. Temperature of steam is higher 
C. Steam pierces through the pores of body quickly 
D. Steam has latent heat

Answer : D. Steam has latent heat

12- A glass tumbler containing ice shows droplets of water on the outer surface because:

A. Water from inside oozes out through the wall of the tumbler 
B. The outer surface of the tumbler shows hygroscopic effect 
C. The moisture in the air on coming in contact with the cold surface of the tumbler condenses into water droplets
D. None of these

Answer : C. The moisture in the air on coming in contact with the cold surface of the tumbler condenses into water droplets

13- Thermos flask keeps a liquid hot because:

A. It has double walls 
B. Heat losses by conduction and radiation are largely prevented
C. Air between the double walls is removed 
D. It has silver coated walls 

Answer : B. Heat losses by conduction and radiation are largely prevented

14- A cut diamond sparkles due to:

A. Its very low refractive index 
B. Total internal reflection 
C. Its high refractive index and small value of the critical angle
D. Its high refractive index and high value of the critical angle 

Answer : C. Its high refractive index and small value of the critical angle

15- When a vehicle passes, TV reception gets distorted. This is because:

A. Metal reflects radio-waves 
B. Spark plug creates electromagnetic disturbances
C. Modern vehicles use electronic ignition system
D. Passing vehicles affects the sophisticated TV components

Answer : B. Spark plug creates electromagnetic disturbances

16- Why is it easier to swim in a sea than a river?

A. Salinity of sea water is more than that of river water 
B. Sea water is still while river water is running 
C. Density of sea water is more than that of river
D. None of these

Answer : C. Density of sea water is more than that of river

17- The ink from the fountain pen spills out when the pen is carried inside an air borne plane, because:

A. The atmospheric pressure at high altitude is less compared to what it is at sea level 
B. The atmospheric pressure at high altitude is more than what it is at sea level
C. The atmospheric pressure keeps changing rapidly 
D. The atmospheric pressure keeps changing rapidly

Answer : A. The atmospheric pressure at high altitude is less compared to what it is at sea level

18- It is observed that when glass is heated, it cracks while metal does not. Which of the following statements explains this phenomenon?

A. Metal is a poor conductor of heat 
B. The expansion of the glass after heating is uniform and therefore it cracks
C. In case of glass the heat is transmitted quickly when it is heated 
D. Glass is a poor conductor of heat

Answer : D. Glass is a poor conductor of heat

19- An ice cube is floating in a glass of water. How will the water level in the glass be affected when the ice cube melts?

A. It will rise 
B. It will go down 
C. It will remain unchanged
D. It would first go up but later on it will go down 

Answer : C. It will remain unchanged

20- Why is a cart pushed continuously on the road to keep it in motion with a constant velocity?

A. To balance the force of friction acting on the cart
B. To increase the force of friction acting on the cart
C. To bring a change in the inertia of the cart 
D. To accelerate the motion of the cart continuously

Answer : A. To balance the force of friction acting on the cart

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