Chapter Exam

Chapter-6 Pressure — Online MCQ Test

Q: What is pressure defined as in physics?

Answer: A. Force applied per unit area — Pressure is the force exerted per unit area. It is calculated as Pressure = Force/Area.

Q: Which of the following is the SI unit of pressure?

Answer: B. Pascal — Pascal (Pa) is the SI unit of pressure. It is equivalent to 1 Newton per square meter (N/m²).

Q: Compare two scenarios: (1) A 50 N force on 5 m² area, (2) A 100 N force on 10 m² area. Which has greater pressure?

Answer: C. Both have equal pressure — Scenario 1: P = 50/5 = 10 Pa. Scenario 2: P = 100/10 = 10 Pa. Both produce equal pressure despite different forces and areas.

SCIENCE (CURIOSITY) · CLASS 8th · Karnataka State Board

Practice Chapter-6 Pressure with a free chapter-wise online MCQ test for Karnataka State Board CLASS 8th SCIENCE (CURIOSITY). This chapter covers: Winds. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-6 Pressure — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 8th SCIENCE (CURIOSITY) — Chapter-6 Pressure, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is pressure defined as in physics?

A. Force applied per unit area ✓
B. Total force acting on an object
C. Weight of an object
D. Density of a substance

Answer: A. Force applied per unit area
Pressure is the force exerted per unit area. It is calculated as Pressure = Force/Area.

Which of the following is the SI unit of pressure?

A. Newton
B. Pascal ✓
C. Joule
D. Watt

Answer: B. Pascal
Pascal (Pa) is the SI unit of pressure. It is equivalent to 1 Newton per square meter (N/m²).

A nail has a pointed tip because:

A. Pointed tips look better
B. The pointed tip has smaller area, producing greater pressure on the surface ✓
C. Pointed tips are cheaper to manufacture
D. It helps carry more weight

Answer: B. The pointed tip has smaller area, producing greater pressure on the surface
A nail's pointed tip has a very small area. Since pressure = force/area, the same force produces much higher pressure, allowing it to penetrate surfaces easily.

Compare two scenarios: (1) A 50 N force on 5 m² area, (2) A 100 N force on 10 m² area. Which has greater pressure?

A. Scenario 1 has greater pressure
B. Scenario 2 has greater pressure
C. Both have equal pressure ✓
D. Cannot be determined

Answer: C. Both have equal pressure
Scenario 1: P = 50/5 = 10 Pa. Scenario 2: P = 100/10 = 10 Pa. Both produce equal pressure despite different forces and areas.

In a hurricane, why is the center (eye) characterized by calm winds and low pressure?

A. Wind doesn't exist at the center
B. The extremely low pressure creates a region where air converges but rotates around it rather than moving inward ✓
C. High pressure blocks wind from entering
D. The eye is shielded by clouds

Answer: B. The extremely low pressure creates a region where air converges but rotates around it rather than moving inward
The hurricane's eye has the lowest pressure in the system. Air tries to rush inward but is deflected by the Coriolis effect, creating a calm, rotating center.