# 8th Class Physics Friction Question Bank

### done Friction HOTS Objective Problems

• A) Icy surface

B) Dry surface

C) Sandy surface

D) Cemented surface

• A) Saw dust in the joints of the door

B) Water in the joints of the door

C) Sand in the joints of the door

D) Oil in the joints of the door

• The cyclist bends in order to

A)  Feel comfortable

B)  Reduce his weight

C)  Reduce the air drag

D)  Increase energy consumptionlution

B) Grinding on stones

C) Making spikes on shoes

D) Powdering a carom board

• A) Hold them easily

B) Reduce their cost

C) Make them strong

D) Increase their friction

• A) II

B) III

C) IV

D) V

• A) ${{F}_{c}}<{{F}_{m}}<{{F}_{s}}$

B) ${{F}_{c}}<{{F}_{s}}<{{F}_{m}}$

C) ${{F}_{m}}<{{F}_{c}}<{{F}_{s}}$

D) ${{F}_{s}}<{{F}_{c}}<{{F}_{s}}$

• A) Oil magnifies the applied muscular force

B) Oil reduces the friction between two surfaces

C) Application of oil generates an upward thrust

D) Application of oil reduces the gravitational force

• A) Sand paper

B) Cardboard sheet

C) Frosted glass sheet

D) Wrinkle-free towel

• A) Temperature

B) Pressure

C) Friction

D) Density

• A) Friction between the wheels and the ground becomes negligible

B) Static fiction, which is greater than rolling friction, comes into play

C) Sliding friction, which is greater than rolling friction, comes into play

D) Friction between the wheels and the ground starts opposing the motion

• A)

 Advantage of Friction Disadvantage of Friction Walking on a surface Writing on a blackboard Flying of an airplane Wearing out of a shoe Wearing out of a shoe

B)

 Advantage of Friction Disadvantage of Friction Flying of an airplane Writing on a blackboard Wearing out of a shoe Applying brake on a moving car Walking on a surface

C)

 Advantage of Friction Disadvantage of Friction Applying brake on a moving car Flying of an airplane Writing on a blackboard Wearing out of a shoe Walking on a surface

D)

 Advantage of Friction Disadvantage of Friction Applying brake on a moving car Flying of an airplane Writing on a blackboard Walking on a surface Wearing out of a shoe

• A) ley surface

B) Sandy surface

C) Wooden surface

D) Cemented surface

• A) i-an increase, ii-an increase

B) i-a decrease, ii-an increase

C) i-an increase, ii-a decrease

D) i-a decrease, ii-a decrease

• A) Conversion of potential energy into heat energy

B) Absorption of heat from the atmosphere

C) Friction between the tyres and the road

D) Conversion of mass into energy

• A) Large friction

B) Smaller friction

C) Large normal force

D) Small normal force

E) None of these

• A) Both statements I and II are true, statement II is the correct explanation for statement I.

B) Both statements I and II are true, statement II is not the correct explanation for statement I.

C) Statement I is true and statement II is false.

D) Statement I is false and statement II is true.

• A) Both statements I and II are true, statement II is correct explanation for statement I.

B) Both statements I and II are true, statement II is not the correct explanation for statement I.

C) Statement I is true and statement II is false.

D) Statement I is false and statement II is true.

• A) Ball bearing

B) Lubricant

C) Rolling

• A)  The heat produced as a result of its motion.

B)  The speed produced as a result of its motion.

C)  The friction between the ball and the surface.

D)  The energy produced as a result of its motion.