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DAV

DAV Public School

Affiliated to CBSE, New Delhi | Affiliation No: XXXXXXX

Competency-Based Assessment Worksheet

Academic Year: 2024-25

Class:

Subject:

Lesson:

Total Marks:

Student Name:

Roll No:

Section:

Date:

📌 Instructions:
• Read all questions carefully before answering.
• Write your answers in the space provided.
• All questions are compulsory.
• This worksheet assesses Understanding, Application, and Analytical Skills as per NEP 2020.

Section A: Multiple Choice Questions (MCQs) 8 × 1 = 8 Marks

Q1. Which of the following is NOT a contact force?

(a) Frictional force
(b) Magnetic force
(c) Muscular force
(d) Normal force

Q2. A force of 50 N is applied on an area of 2 m². The pressure exerted will be:

(a) 100 Pa
(b) 25 Pa
(c) 50 Pa
(d) 52 Pa

Q3. The pressure exerted by a liquid at the bottom of a container depends on:

(a) Height of liquid column only
(b) Area of the container only
(c) Height and density of liquid
(d) Volume of the container

Q4. When we press a drawing pin with our thumb, which experiences greater pressure?

(a) The thumb
(b) The drawing pin
(c) Both experience equal pressure
(d) Neither experiences pressure

Q5. The atmospheric pressure at sea level is approximately:

(a) 10⁵ Pa
(b) 10³ Pa
(c) 10² Pa
(d) 10⁶ Pa

Q6. Which principle explains why ships float on water?

(a) Archimedes' principle
(b) Pascal's law
(c) Newton's third law
(d) Bernoulli's principle

Q7. A sharp knife cuts vegetables more easily than a blunt one because:

(a) It has more mass
(b) It exerts more pressure due to smaller area
(c) It has more force
(d) It has friction

Q8. The SI unit of pressure is:

(a) Newton (N)
(b) Pascal (Pa)
(c) Joule (J)
(d) Watt (W)

Section B: Assertion & Reasoning 4 × 1 = 4 Marks

Directions: In each of the following questions, an Assertion (A) is given followed by a Reason (R). Mark your answer as:
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is NOT the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

Q9.

Assertion (A): A camel can walk easily on sand.
Reason (R): A camel has broad feet which increase the area of contact, reducing pressure.

Q10.

Assertion (A): Atmospheric pressure decreases as we go higher.
Reason (R): The density of air decreases with height.

Q11.

Assertion (A): A ball moving on a surface slows down and eventually stops.
Reason (R): Frictional force acts in the direction of motion.

Q12.

Assertion (A): Heavy trucks have broad tyres.
Reason (R): Broad tyres increase the area of contact and reduce pressure on the road.

Section C: Case-Based / Source-Based Questions 2 × 4 = 8 Marks

Case Study 1: Dam Construction

Engineers are designing a dam to store water for irrigation. They know that the pressure exerted by water increases with depth. The walls of the dam need to be thicker at the bottom than at the top to withstand the greater pressure. The pressure at any point in a liquid depends on the depth of that point from the surface and the density of the liquid. The formula for liquid pressure is P = ρgh, where ρ is density, g is acceleration due to gravity, and h is height of liquid column.

(i) Why are dam walls made thicker at the bottom?

(ii) If the depth of water is doubled, how does the pressure change?

(iii) What would happen if sea water (higher density) was used instead of fresh water at the same depth?

(iv) Calculate the pressure at a depth of 10 m in water. (Take ρ = 1000 kg/m³, g = 10 m/s²)