Class 8 Science

# Force Pressure

## Extra Questions

### Multiple Choice Questions

Question 1: Which force is being applied by a vendor when he is pushing the pushcart?

• Muscular force
• Magnetic force
• Friction
• Electrostatic force

Answer: (a) Muscular force

Question 2: What will happen to the speed of a car when the driver applies brakes?

• Speed increases
• Speed decreases
• No change in speed
• Change in direction

Answer: (b) Speed decreases

Question 3: Which force always opposes motion?

• Magnetic force
• Electrostatic force
• Friction
• Muscular force

Answer: (c) Friction

Question 4: When your friend pushes your bike from behind, what will happen to the speed of the bike?

• Speed decreases
• Speed increases
• No change
• Any of the above

Answer: (b) Speed increases

Question 5: Which of the following possess gravitation?

• Earth
• Venus
• Saturn
• All of the above

Answer: (d) All of the above

Question 6: How much weight of air is always over your head?

• 1000 kg
• 100 kg
• 10 kg
• 1 kg

Answer: (a) 1000 kg

Question 7: Which force causes a charged balloon to attract another balloon?

• Muscular force
• Electrostatic force
• Magnetic force
• Gravitational force

Answer: (b) Electrostatic force

Question 8: A dropper to fill ink works because of which of the following?

• Friction
• Magnetic force
• Air pressure
• Electrostatic force

Answer: (c) Air pressure

Question 9: What is the SI unit of force?

• Newton
• Galileo
• Einstein
• Faraday

Answer: (a) Newton

Question 10: Which animal can easily walk in desert?

• Lion
• Zebra
• Giraffe
• Camel

Answer: (d) Camel

#### Very Short Answer Type Questions

Question 1: What is force?

Answer: A push or pull on an object is called force.

Question 2: What is a contact force?

Answer: Contact force is a force which can produce its effect only by making a contact with object.

Question 3: What is a non-contact force?

Answer: The non-contact force is a force which can produce its effect without making a contact with object.

Question 4: What is muscular force?

Answer: It is the force applied by muscles of humans or animals.

Question 5: What is friction?

Answer: When one surface is moving over another surface, a force comes into play and opposes their relative motion. This force is called friction or force of friction.

Question 6: What is magnetic force?

Answer: The force applied by a magnet is called magnetic force.

Question 7: What is electrostatic force?

Answer: It is the force applied by a charged body on another charged or non-charged body.

Question 8: What is gravitational force?

Answer: Gravitational force is the force which is exerted by every object in the universe.

Question 9: What is pressure?

Answer: The force acting on a unit area on an object is called pressure.

Question 10: What is atmospheric pressure?

Answer: The pressure exerted by atmospheric air is called atmospheric pressure.