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Test: Newton's First Law Of Motion - Class 9 MCQ


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5 Questions MCQ Test Science Class 9 - Test: Newton's First Law Of Motion

Test: Newton's First Law Of Motion for Class 9 2024 is part of Science Class 9 preparation. The Test: Newton's First Law Of Motion questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Newton's First Law Of Motion MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Newton's First Law Of Motion below.
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Test: Newton's First Law Of Motion - Question 1

The people in a bus are pushed backwards when the bus starts suddenly because of:

Detailed Solution for Test: Newton's First Law Of Motion - Question 1

When the bus is not moving the passengers are in the state of rest and they have inertia of rest. When the bus starts moving suddenly, the lower part of the body of passengers, which is in contact with the bus, come in motion, but upper part of their body tends to be in the state of rest and the passengers fall backward.

Test: Newton's First Law Of Motion - Question 2

 

In a football and stone of same size, the inertia of

Detailed Solution for Test: Newton's First Law Of Motion - Question 2

Inertia of stone is greater than the inertia of football because mass of stone is higher than the mass of football even both are of same size.

Test: Newton's First Law Of Motion - Question 3

A cyclist of mass 30 kg exerts a force of 250 N to move his cycle. The acceleration is 4 ms−2. The force of friction between the road and tyres will be

Detailed Solution for Test: Newton's First Law Of Motion - Question 3

Force - force of friction = mass × acceleration
250 - f = 30 × 4
f = 250 - 120
= 130N

Test: Newton's First Law Of Motion - Question 4

While dusting a carpet we beat it with a stick because:

Detailed Solution for Test: Newton's First Law Of Motion - Question 4

When a hanging carpet is beaten with a stick, the dust particles are removed from it because the carpet on beating suddenly moves forward and the dust particles due to inertia of rest continue to remain at rest. Hence the dust particles fall down and the carpet gets cleaned.

Test: Newton's First Law Of Motion - Question 5

If no external force acts on a moving object:

Detailed Solution for Test: Newton's First Law Of Motion - Question 5

If no force is applied to a moving object, it should remain in motion as per the first law of motion. But, it is stopped due to friction.

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