Specific heat capacity of water is 4200 J/kg°C. How much heat is required to raise temperature of 2 kg water by 10°C? MCQ with Answer and Explanation

Specific heat capacity of water is 4200 J/kg°C. How much heat is required to raise temperature of 2 kg water by 10°C?
A. 84000 J
B. 4200 J
C. 8400 J
D. 42000 J
Answer: Option A
Solution (By JKExamLibrary)
Q = mcΔθ = 2 × 4200 × 10 = 84,000 J = 84 kJ. Large specific heat of water makes it useful for cooling and climate moderation. Always check units: mass kg, c J/kg°C, ΔT °C.

This question belongs to: Science Physics

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1 Report Error
The rate of change of momentum is equal to
A. Power
B. Work
C. Impulse
D. Force

Correct Answer: Option D


Explanation:
F = dp/dt (Newton's second law original form). Impulse is Δp. Work F·s. Power dW/dt.

This question belongs to: Science Physics
Question #2 Report Error
A microwave oven heats food primarily by exciting which specific molecules in the food?
A. Protein molecules
B. Water molecules
C. Carbohydrate molecules
D. Fat molecules

Correct Answer: Option B


Explanation:
Microwave ovens use electromagnetic radiation in the microwave frequency range (usually around 2.45 GHz). Water molecules have a permanent electric dipole moment. The oscillating electric field of the microwaves rapidly forces the water molecules to flip back and forth to align with the field, generating thermal energy via friction and effectively heating the food from within.

This question belongs to: Science Physics
Question #3 Report Error
The nucleus of an atom contains
A. Protons and neutrons
B. Electrons and protons
C. Electrons and neutrons
D. Only neutrons

Correct Answer: Option A


Explanation:
Protons (positive), neutrons (neutral). Electrons orbit outside. Hydrogen nucleus only proton. Heavy elements have more neutrons.

This question belongs to: Science Physics