Challenge Corner: Olympiad Style Problems- class 8

🌟 Challenge Corner: Olympiad Style Measurement Problems

1. Match the following Fundamental Quantities with their SI Units:

Quantity	SI Unit
a) Length	i) kg
b) Temperature	ii) s
c) Mass	iii) m
d) Time	iv) K

Answer: a → iii (m), b → iv (K), c → i (kg), d → ii (s)

2. A boy runs 100 metres in 10 seconds. What is his speed and its unit?

Hint: Speed = Distance ÷ Time
Answer: 100 ÷ 10 = 10 m/s

3. Assertion and Reason:

Assertion (A): Work is a derived quantity.
Reason (R): Work is equal to force multiplied by displacement.

Choose:
a) Both A and R are true and R is the correct explanation.
b) Both A and R are true but R is not the correct explanation.
c) A is true, R is false.
d) A is false, R is true.

Answer: a) Both A and R are true and R is the correct explanation.

4. A force of 20 N is applied on a box and it moves 3 m. Calculate the work done.

Work = Force × Distance = 20 × 3 = 60 J (joules)

5. Identify whether the following are fundamental or derived quantities:

Quantity	Type
Pressure	(Your answer)
Electric current	(Your answer)
Density	(Your answer)

Pressure → Derived
Electric current → Fundamental
Density → Derived