According to the principle of homogeneity of dimensions, in an equation A = B + C, what must be true about the dimensions of A, B, and C? MCQ with Answer and Explanation

According to the principle of homogeneity of dimensions, in an equation A = B + C, what must be true about the dimensions of A, B, and C?
A. A, B, and C must all have identical dimensions.
B. B and C must be dimensionless.
C. A must be dimensionless.
D. A must equal B times C.
Answer: Option A
Solution (By JKSSB Mock Tests)
The principle of homogeneity states that you can only add or subtract physical quantities that have the exact same dimensional formula (you can't add mass to length). Therefore, in the equation A = B + C, the terms B and C must have the same dimensions, and their sum will yield a quantity A that also shares those exact same dimensions.

Discuss this Question (0)

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

Practice More Physics Questions

Question #1
A force of 12 N gives an object acceleration 4 m/s². Mass of object is
A. 3 kg
B. 8 kg
C. 48 kg
D. 0.33 kg

Correct Answer: Option A


Explanation:
m = F/a = 12/4 = 3 kg.

This question belongs to: Science Physics
Question #2
The focal length of a concave mirror is 15 cm. The radius of curvature is
A. 15 cm
B. 30 cm
C. 7.5 cm
D. 45 cm

Correct Answer: Option B


Explanation:
For spherical mirrors, R = 2f. So R = 2 × 15 = 30 cm. Sign convention: for concave mirror, f and R are negative by Cartesian convention, but magnitude 30 cm. So 30 cm is correct.

This question belongs to: Science Physics
Question #3
Pressure cooker cooks food faster because
A. High pressure lowers boiling point
B. High pressure raises boiling point
C. Low pressure raises boiling point
D. Temperature is low

Correct Answer: Option B


Explanation:
Higher pressure inside increases boiling point, food cooks at higher temperature.

This question belongs to: Science Physics