The dimensional formula for work is MCQ with Answer and Explanation

Question Report Error

The dimensional formula for work is

A. [ML²T⁻²]

B. [MLT⁻¹]

C. [MLT⁻²]

D. [ML²T⁻¹]

Answer: Option A

Solution (By JKExamLibrary)

Work = Force × displacement = [MLT⁻²][L] = [ML²T⁻²].

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

Angular momentum dimensions:

A. [ML²T⁻²]

B. [MLT⁻¹]

C. [ML²T⁻¹]

D. [M⁰L⁰T⁰]

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Correct Answer: Option C

Explanation:
L = r × p: [L][MLT⁻¹] = [ML²T⁻¹]. Same as Planck's constant. Memory tip: 'Angular momentum: [ML²T⁻¹]; action quantities share dimensions'. Dimensional analysis frequently tested in competitive exams.

This question belongs to: Science Physics

Question #2 Report Error

According to Wien's Displacement Law, if the absolute temperature of a radiating black body is doubled, the wavelength corresponding to maximum spectral emissive power will:

A. Halve

B. Remain unchanged

C. Increase four times

D. Double

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Correct Answer: Option A

Explanation:
Wien's Displacement Law states that the wavelength at which a black body emits maximum radiation (lambda_m) is inversely proportional to its absolute temperature (T). lambda_m * T = b (Wien's constant). If the temperature T is doubled (2T), the peak wavelength lambda_m must strictly halve to maintain the constant product.

This question belongs to: Science Physics

Question #3 Report Error

A radioactive substance has half-life of 10 days. Fraction remaining after 30 days is

A. 1/2

B. 1/8

C. 1/4

D. 1/16

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Correct Answer: Option B

Explanation:
Number of half-lives = 30/10 = 3. Remaining = (1/2)³ = 1/8. Exponential decay N = N₀(1/2)^(t/T). Radioactive decay constant λ = ln2/T.

This question belongs to: Science Physics

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