Test: Friction - 2 - UPSC MCQ

# Test: Friction - 2 - UPSC MCQ

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

Test: Friction - 2 for UPSC 2024 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 2024 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

### Why are objects given special shapes when moving through fluids?

Detailed Solution for Test: Friction - 2 - Question 1
Objects are given special shapes to reduce fluid friction, minimizing the energy lost when moving through fluids.
Test: Friction - 2 - Question 2

### Friction is a __________

Detailed Solution for Test: Friction - 2 - Question 2
• Friction is the force that resists the relative motion or tendency of such motion of two surfaces in contact.
• Friction occurs when two surfaces are in contact with each other.
• Friction can cause wear and tear on surfaces, generate heat, and affect the efficiency of machines.

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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

The threaded tyres of cars, trucks and bus

Detailed Solution for Test: Friction - 2 - Question 4

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 5

The shape of fish is streamlined to ________.

Detailed Solution for Test: Friction - 2 - Question 5
• 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 6

Carpenters often grease screws before fixing them to

Detailed Solution for Test: Friction - 2 - Question 6

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 7

What do ball bearings replace in most machines to reduce friction?

Detailed Solution for Test: Friction - 2 - Question 7
• Bearings are mechanical assemblies that consist of rolling elements and usually inner and outer races which are used for rotating or linear shaft applications. There are several different types of bearings, including ball and roller bearings.
• A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races.
• The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.
Test: Friction - 2 - Question 8
What type of friction occurs when one body rolls over the surface of another body?
Detailed Solution for Test: Friction - 2 - Question 8
Rolling friction occurs when one body rolls over the surface of another body, reducing the resistance compared to sliding friction.
Test: Friction - 2 - Question 9
Why is it easier to pull luggage fitted with rollers?
Detailed Solution for Test: Friction - 2 - Question 9
Rollers reduce friction by converting sliding friction to rolling friction, making it easier to pull luggage.
Test: Friction - 2 - Question 10

The substance which reduce friction are called

Detailed Solution for Test: Friction - 2 - Question 10

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

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