BPSC CCE Prelims
Motion and Laws of Motion Previous Year Questions (PYQs)
Practice solved questions for Motion and Laws of Motion with detailed step-by-step solutions, key insights, and trend analysis for BPSC CCE PRELIMS.
Solved Previous Year Questions
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We apply a force of 200 Newtons on a wooden Box and push it on the floor at constant velocity. The marginal friction force will be:
Detailed Explanation:
Constant velocity means net force = 0, so applied force equals friction force.
Applied force = 200 N, therefore kinetic friction = 200 N.
A truck starts from rest down a hill with a constant acceleration. It achieves 400 meters in 20 seconds. If the weight of the truck is 7 tons then what will be the force acting on it?
Detailed Explanation:
Given: Initial velocity u = 0 (starts from rest), displacement s = 400 m, time t = 20 s, mass m = 7 tons = 7000 kg.
Step 1 – Find acceleration: Using s = ut + ½at²
400 = 0 + ½ × a × (20)²
400 = 200a
a = 2 m/s²
Step 2 – Calculate force: Using F = ma
F = 7000 × 2
F = 14000 N
Answer: 14000 Newtons
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to
Detailed Explanation:
✅ Statement 1 – Correct: By pulling hands backwards, the goalkeeper increases the time duration over which the ball's momentum changes to zero. Since Force = rate of change of momentum (F = Δp/Δt), increasing Δt decreases the force experienced, thereby decreasing the rate of change of momentum.
❌ Statement 2 – Incorrect: Pulling hands backwards reduces the force exerted on the ball, not increases it, by extending the time of contact.
❌ Statement 3 – Incorrect: The action decreases the force exerted by the ball on hands by increasing the stopping time, as per Newton's Third Law.
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Centripetal force is responsible to
Detailed Explanation:
Centripetal force is the net force directed towards the center of a circular path that keeps an object moving in circular motion.
Without centripetal force, an object would continue moving in a straight line due to inertia (Newton's first law), not along a curved path.
Examples: Tension in a string (whirling stone), gravitational force (planetary orbits), friction (car turning).
A bus is moving along a straight path and takes a sharp turn to the right side suddenly. The passengers sitting on the bus will
Detailed Explanation:
When a bus takes a sharp right turn, the passengers' bodies tend to continue moving in a straight line due to inertia of motion.
Since the bus turns right, the passengers experience a tendency to move in the original direction, causing them to bend towards the left side relative to the bus.
This is an application of Newton's First Law of Motion (law of inertia), which states that a body in motion continues in its state unless acted upon by an external force.
The working principle of a washing machine is
Detailed Explanation:
A washing machine uses centrifugal force during the spin cycle to separate water from clothes based on density differences.
- Centrifugation Principle: High-speed drum rotation creates outward force, pushing water through perforations while retaining heavier clothes inside.
- Therefore, the washing machine operates on centrifugation, making Option 2 the correct answer.
Who is the first person to define speed?
Detailed Explanation:
Galileo Galilei was the first to define speed quantitatively as distance covered per unit of time.
- Historical Context: Galileo introduced the concept during his studies on motion and kinematics in the early 17th century.
- Significance: He established speed as a measurable scalar quantity, laying the foundation for classical mechanics.
- Therefore, Galileo is credited with the first definition of speed, making Option 4 the correct answer.
If a feather, a rubber ball and a wooden ball are falling freely simultaneously from the same height in vacuum, then
Detailed Explanation:
In a vacuum, all objects fall with the same acceleration (g = 9.8 m/s²) regardless of mass or composition, as demonstrated by Galileo's principle. Without air resistance, a feather, rubber ball, and wooden ball experience identical downward acceleration.
Air resistance normally causes lighter objects like feathers to fall slower on Earth, but in vacuum conditions this factor is completely eliminated, making mass and material properties irrelevant to fall time.
Therefore, all three objects reach the ground simultaneously, making Option 4 the correct answer.
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