Test: Friction - 1

# Test: Friction - 1 - Class 8

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## 10 Questions MCQ Test - Test: Friction - 1

Test: Friction - 1 for Class 8 2023 is part of Class 8 preparation. The Test: Friction - 1 questions and answers have been prepared according to the Class 8 exam syllabus.The Test: Friction - 1 MCQs are made for Class 8 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Friction - 1 below.
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Test: Friction - 1 - Question 1

### A ball rolling on ground slows down and finally stops because of:

Detailed Solution for Test: Friction - 1 - Question 1
• A ball rolling on ground slows down and finally stops because of friction offered by the ground.
• Frictional force works in the opposite direction of motion to slow down the ball.
Test: Friction - 1 - Question 2

### In the figure below, a boy is shown pushing the box from right to left. The force of friction will act on the box ______.

Detailed Solution for Test: Friction - 1 - Question 2

Friction always acts in the opposite direction to the motion, hence the force of friction will be from left to right.

Test: Friction - 1 - Question 3

### Friction produces:

Detailed Solution for Test: Friction - 1 - Question 3

Friction produces heat. When two moving surface are in contact of each other, they produce friction due to which heat is developed.
Example: Moving fans become hot due to this friction.

Test: Friction - 1 - Question 4

Sliding friction is ______________ than static friction.

Detailed Solution for Test: Friction - 1 - Question 4
• Friction comes into play when irregularities present in the surfaces of two objects in contact get interlocked with each other.
• In sliding, the time given for interlocking is very small. Hence, the interlocking is not strong.
• Therefore, less force is required to overcome this interlocking. Because of this reason, sliding friction is less than static friction.
Test: Friction - 1 - Question 5

Sprinkling of powder on the carrom board ______.

Detailed Solution for Test: Friction - 1 - Question 5

We sprinkle powder on carrom board to make the surface of the board smooth. This reduces the friction between the surface of the carrom board, the striker and the coins. As a result, the coins and the striker can move easily on the carrom board.

Test: Friction - 1 - Question 6

Fluid friction can be minimized by:

Detailed Solution for Test: Friction - 1 - Question 6

The substances that flow are called fluid. Liquid and gases are common fluid. Friction in fluid can be minimized by giving suitable shape as streamline to ships and airplanes.

Test: Friction - 1 - Question 7

A toy car released with the same initial speed will travel farthest on:

Detailed Solution for Test: Friction - 1 - Question 7

A polished marble surface has the least frictional force, hence a car will travel farther on a marble floor.

Test: Friction - 1 - Question 8

In machine, friction between moving parts is reduced by:

Detailed Solution for Test: Friction - 1 - Question 8

In machine, friction between moving parts is reduced by using lubricants. These lubricants stick with machine parts to make them smoother that leads to reduction in friction.

Test: Friction - 1 - Question 9

Friction opposes the __________ between two surfaces in contact.

Detailed Solution for Test: Friction - 1 - Question 9

Friction opposes the relative motion between two surfaces in contact. Frictional force acts in opposite direction of motion to slow down the speed of moving body.

Test: Friction - 1 - Question 10

Fluids are ______.

Detailed Solution for Test: Friction - 1 - Question 10
• Fluid is a general term, that both liquid and gas fit under.
• A liquid has a definite volume and is incompressible.
• All liquids are fluids, but not all fluids are liquids.
• Therefore, fluids are a subset of the phases of matter and include liquids, gases, plasmas and, to some extent, plastic solids, etc.
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