Test: Friction - 1 - UPSC MCQ

# Test: Friction - 1 - UPSC MCQ

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## 20 Questions MCQ Test Science & Technology for UPSC CSE - Test: Friction - 1

Test: Friction - 1 for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Friction - 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Friction - 1 MCQs are made for UPSC 2024 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

### Sprinkling of powder on the carrom board ______.

Detailed Solution for Test: Friction - 1 - Question 1

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 2

### Sliding friction is ______________ than static friction.

Detailed Solution for Test: Friction - 1 - Question 2
• 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.
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Test: Friction - 1 - Question 3

### Why do we slip when we step on a banana peel?

Detailed Solution for Test: Friction - 1 - Question 3
The banana peel reduces the friction between our feet and the ground, making it easier to slip.
Test: Friction - 1 - Question 4
What is a spring balance used for?
Detailed Solution for Test: Friction - 1 - Question 4
A spring balance measures the force acting on an object by stretching a coiled spring.
Test: Friction - 1 - Question 5
How does the smoothness of surfaces affect friction?
Detailed Solution for Test: Friction - 1 - Question 5
Smoother surfaces have fewer irregularities, leading to less interlocking and therefore less friction.
Test: Friction - 1 - Question 6
What helps increase the grip of a shoe on the floor?
Detailed Solution for Test: Friction - 1 - Question 6
Grooved soles provide better grip on the floor by increasing friction.
Test: Friction - 1 - Question 7
Why is it difficult to walk on a wet floor?
Detailed Solution for Test: Friction - 1 - Question 7
Wet floors reduce the friction between our feet and the ground, making it harder to walk without slipping.
Test: Friction - 1 - Question 8

Friction is caused by the irregularities on the two __________ in contact.

Detailed Solution for Test: Friction - 1 - Question 8

Friction is caused by the irregularities on the two surfaces in contact. This means that when two things are touching each other, the bumps and rough parts on their surfaces stick together, making it harder to move them against each other. So, the correct answer is "Surfaces."

Test: Friction - 1 - Question 9
What does the reading on a spring balance indicate when a brick begins to move?
Detailed Solution for Test: Friction - 1 - Question 9
The reading on the spring balance gives a measure of the force of friction between the brick and the floor when the brick just begins to move.
Test: Friction - 1 - Question 10

State whether the following statement is True or False

Friction always acts in the same direction as the applied force.

Detailed Solution for Test: Friction - 1 - Question 10
• When we push or pull an object, friction acts in the opposite direction to the motion.
• So, if we push a book to the right, friction acts to the left, and if we push it to the left, friction acts to the right.
• This means friction opposes the motion, trying to stop the object from moving.
• So, the statement is False.
Test: Friction - 1 - Question 11

Friction opposes the __________ between two surfaces in contact.

Detailed Solution for Test: Friction - 1 - Question 11

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 12

Fluid friction can be minimized by:

Detailed Solution for Test: Friction - 1 - Question 12

Fluid friction can be minimized by giving suitable shapes to the objects moving in the fluids.

Test: Friction - 1 - Question 13
What increases the force of friction between two surfaces?
Detailed Solution for Test: Friction - 1 - Question 13
Increasing the pressure between two surfaces increases the interlocking of irregularities, thereby increasing friction.
Test: Friction - 1 - Question 14
What is the effect of friction when a jar of a mixer is operated?
Detailed Solution for Test: Friction - 1 - Question 14
Friction between the moving parts generates heat, causing the jar of the mixer to become hot.
Test: Friction - 1 - Question 15

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

Detailed Solution for Test: Friction - 1 - Question 15

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

Test: Friction - 1 - Question 16

In machine, friction between moving parts is reduced by:

Detailed Solution for Test: Friction - 1 - Question 16

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 17

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 17

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 18

Objects moving through fluids experience _______ force.

Detailed Solution for Test: Friction - 1 - Question 18

When objects move through fluids like air or water, they experience a force called frictional force. This force makes it harder for objects to move smoothly through the fluid.

Test: Friction - 1 - Question 19
What happens to the contact points on a surface when an object starts sliding?
Detailed Solution for Test: Friction - 1 - Question 19
When an object starts sliding, the contact points on its surface do not get enough time to lock into the contact points on the other surface, reducing friction.
Test: Friction - 1 - Question 20
Why is it easier to move a box already in motion than to start moving it?
Detailed Solution for Test: Friction - 1 - Question 20
The force required to overcome static friction (to start moving) is greater than the force required to overcome sliding friction (to keep it moving).

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