COMEDK 2023 Evening Shift | Units & Measurements Question 4 | Physics

The time dependence of a physical quantity P is give by $$\mathrm{P=P}_0 \exp \left(-\alpha t^2\right)$$ where $$\alpha$$ is a constant and $$t$$ is time. The constant $$\alpha$$ will

Have dimensions as that of $$\mathrm{P}$$

Have dimensions equal to that of $$\mathrm{Pt}^2$$

Have no dimensions

Have dimensions of $$t^{-2}$$

COMEDK 2023 Evening Shift

MCQ (Single Correct Answer)

-0

A tentative explanation of observations without assuming that it is true is called

hypothesis

physical laws

theory

model

COMEDK 2021

MCQ (Single Correct Answer)

-0

Which of the following statement is incorrect?

Classical Physics deals with macroscopic phenomena and includes subject like mechanics, electrodynamics, optics and thermodynamics.

All Physics and also mathematics is based on assumptions each of which is variously called hypothesis or axiom or postulate etc.

A hypothesis is a supposition with assuming that is true.

An axiom is a self-evident truth, while a model is a theory proposed to explain observed phenomena.

COMEDK 2021

MCQ (Single Correct Answer)

-0

Which of the following technique is not used for measuring small time intervals?

Electronic oscillator

Decay of elementary particles

Atomic clock

Spring oscillator

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