The rate of change of displacement is MCQ with Answer and Explanation

Question Report Error

The rate of change of displacement is

A. Velocity

B. Momentum

C. Acceleration

D. Speed

Answer: Option A

Solution (By JKExamLibrary)

Velocity = d(displacement)/dt. Speed is rate of change of distance.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A typical LED converts electrical energy into light with efficiency around

A. 10%

B. 100%

C. 80-90%

D. 50-60%

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Correct Answer: Option C

Explanation:
LEDs are highly efficient, converting ~80-90% of electrical energy into light, rest heat. Incandescent bulbs ~10% efficient. LED long life, low power. Blue LED Nobel prize 2014.

This question belongs to: Science Physics

Question #2 Report Error

Why does food cook faster in a pressure cooker?

A. The trapped steam adds extra heat directly to the food.

B. Increased pressure lowers the boiling point of water.

C. Increased pressure raises the boiling point of water.

D. The metal of the cooker conducts heat much faster.

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Correct Answer: Option C

Explanation:
In an open vessel, water boils at 100°C, and extra heat merely creates steam rather than raising the temperature. A pressure cooker traps steam, increasing the internal pressure above atmospheric pressure. Increased pressure raises the boiling point of water (often to around 120°C). Cooking the food at this higher temperature significantly reduces cooking time.

This question belongs to: Science Physics