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# Test: Friction - 2 - UPSC

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## 20 Questions MCQ Test Science & Technology for UPSC CSE - Test: Friction - 2

Test: Friction - 2 for UPSC 2023 is part of Science & Technology for UPSC CSE preparation. The Test: Friction - 2 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Friction - 2 MCQs are made for UPSC 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Friction - 2 below.
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Test: Friction - 2 - Question 1

### Which of the following device is used to reduce friction?

Detailed Solution for Test: Friction - 2 - Question 1

In moving part of machine, ball bearing is used to reduce friction because rolling friction is always less than sliding friction or static friction.

Test: Friction - 2 - Question 2

### Thermos flask keeps hot liquid hot and cold liquid cold by

Detailed Solution for Test: Friction - 2 - Question 2

The thermos flask keeps hot liquid hot and cold liquid cold by preventing heat loss. Thermos flask have double layered wall in which air is evacuated to prevent heat loss.

Test: Friction - 2 - Question 3

### The frictional force exerted by fluids is also called

Detailed Solution for Test: Friction - 2 - Question 3

The frictional force exerted by fluids is also called as drag. This kinds of frictional force can be reduced by changing the shape of the moving body.

Test: Friction - 2 - Question 4

Striking a matchstick produces fire by

Detailed Solution for Test: Friction - 2 - Question 4

When a matchstick is rubbed on match box fire is produced due to friction. Matchstick contain phosphorous that catch fire easily at very low temperature.

Test: Friction - 2 - Question 5

The substance which reduce friction are called

Detailed Solution for Test: Friction - 2 - Question 5

The substances which reduce friction are called lubricants. Lubricants include graphite, oils and greases. Lubricant stick with moving part to reduce friction.

Test: Friction - 2 - Question 6

The threaded tyres of cars, trucks and bus

Detailed Solution for Test: Friction - 2 - Question 6

The treaded tyres of cars, trucks and bulldozers increase friction force between road and tyres and provide a better grip with the ground.
Friction is the resistance to motion of one object moving relative to another.
Friction is a resultant force not a fundamental one like the electromagnetic force.

Test: Friction - 2 - Question 7

It is easier to hold a earthen pot than steel pot as

Detailed Solution for Test: Friction - 2 - Question 7

It is easier to hold an earthen pot than steel pot as earthen pot has rough surface than steel that provide more friction and better grips while holding.

Test: Friction - 2 - Question 8

Carpenters often grease screws before fixing them to

Detailed Solution for Test: Friction - 2 - Question 8

Carpenters while fixing screws, grease the tips of screen to decrease the friction. Grease present on screw reduce the friction offered by wood articles.

Test: Friction - 2 - Question 9

Which of the following is a contact force?

Detailed Solution for Test: Friction - 2 - Question 9

Friction is a contact force because in friction both the bodies are in direct contact with each other moving in opposite direction.

Test: Friction - 2 - Question 10

The shape of fish is streamlined to

Detailed Solution for Test: Friction - 2 - Question 10

The shape of fish is streamlined that help in decreasing fluid friction. The narrower part of streamlined shape offer less resistance due to friction.

Test: Friction - 2 - Question 11

In which of the following activities friction is useful?

Detailed Solution for Test: Friction - 2 - Question 11

Friction is called as necessary evils because friction is necessary for even walking. Without friction movement of vehicle is not possible on road.

Test: Friction - 2 - Question 12

A body will remain in state of motion on rolling on ground if

Detailed Solution for Test: Friction - 2 - Question 12

Friction presents in ground slowdown the speed of rolling body. A body will remain in state of motion on rolling on ground if friction is absent.

Test: Friction - 2 - Question 13

Soapy water on floor would make it

Detailed Solution for Test: Friction - 2 - Question 13

Soapy water on floor would make it difficult to walk on floor due to less friction. The irregularities present on floor are reduced by soapy water that reduces the friction drastically.

Test: Friction - 2 - Question 14

Which shape is useful for movement in fluid?

Detailed Solution for Test: Friction - 2 - Question 14

Fluids also offer resistance while a body is moving in fluid. Streamlined shape is useful for movement in fluid as it offer less resistance due to friction.

Test: Friction - 2 - Question 15

Which of the following will offer least friction to run a toy car?

Detailed Solution for Test: Friction - 2 - Question 15

Wet marble will offer least friction to run a toy car as the roughness or irregularities in wet marble is reduced due to presence of water.

Test: Friction - 2 - Question 16

Which of the following is characteristic of friction?

Detailed Solution for Test: Friction - 2 - Question 16

Friction always works opposite to direction of motion. A moving ball slows down due to frictional force working opposite to direction of motion.

Test: Friction - 2 - Question 17

Which of the following is known as friends as well as enemy?

Detailed Solution for Test: Friction - 2 - Question 17

Friction is known as friends as well as enemy because friction is useful as well as harmful for us. Without friction it is impossible to walk on ground or move vehicle. On the other hand friction causes wear and tear in shoes and tyres.

Test: Friction - 2 - Question 18

Friction is a __________

Test: Friction - 2 - Question 19

Brakes of vehicle is stopped by using brake that works on property of

Detailed Solution for Test: Friction - 2 - Question 19

Brakes of vehicle is stopped by using brake fitted in wheels of vehicle. Brakes work on property of friction. Brakes attach with wheel on applying brake that slows down the vehicle.

Test: Friction - 2 - Question 20

Friction is caused by the

Detailed Solution for Test: Friction - 2 - Question 20

Friction is caused by irregularities on the two surfaces in contact. These irregularities create locks between the surface that cause friction.

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