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Class 9 force and Laws of motion mcq. We covered all the Class 9 force and Laws of motion mcq in this post for free so that you can practice well for the exam.
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Class 9 force and Laws of motion Objective mcq for Students
A person is seated in a stationary car. Each of the four wheels experiences an equal reaction force R from the road. When the car starts moving uniformly along a straight, level road, how does the reaction at each front wheel change?
A) It becomes greater than R
B) It becomes less than R
C) It remains equal to R
D) It depends on the nature of the road surface
Option b – It becomes less than R
A tanker carrying oil is partially filled and accelerates uniformly along a horizontal road. What happens to the free surface of the oil?
A) It stays horizontal
B) It tilts with a smaller depth at the rear end
C) It tilts with a greater depth at the rear end
D) It takes the shape of a parabola
Option d – It takes the shape of a parabola
Assertion (A): A person standing on a perfectly frictionless surface can move himself forward by whistling. Reason (R): If no external force acts on a system, its total momentum remains unchanged.
Choose the correct option.
A) Both A and R are true, and R correctly explains A
B) Both A and R are true, but R does not correctly explain A
C) A is true, but R is false
D) A is false, but R is true
Option b – Both A and R are true, but R does not correctly explain A
Statement: To start moving a loaded cart, more force is required than to keep it moving. Which conclusion can be logically drawn from this statement?
A) The weight of a moving object decreases
B) The wheels initially tend to slip
C) Friction is lower once the cart is in motion
D) Regular practice improves efficiency
Option c – Friction is lower once the cart is in motion
A four-wheeled vehicle moves at high speed along a sharp circular curve. Which of the following effects may occur?. 1. The vehicle may topple about the outer wheels 2. The vehicle may topple about the inner wheels 3. The vehicle may skid outward 4. The vehicle may skid inward. Choose the correct option.
A) Only 1 and 3
B) Only 2 and 4
C) Only 2 and 3
D) Only 1 and 4
Option c – Only 2 and 3
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