1
COMEDK 2024 Morning Shift
+1
-0

Find the value of '$$n$$' in the given equation $$P=\rho^n v^2$$ where '$$P$$' is the pressure, '$$\rho$$' density and '$$v$$' velocity.

A
$$\mathrm{n}=\frac{1}{2}$$
B
$$\mathrm{n}=1$$
C
$$\mathrm{n}=3$$
D
$$\mathrm{n}=2$$
2
COMEDK 2023 Evening Shift
+1
-0

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

A
Have dimensions as that of $$\mathrm{P}$$
B
Have dimensions equal to that of $$\mathrm{Pt}^2$$
C
Have no dimensions
D
Have dimensions of $$t^{-2}$$
3
COMEDK 2023 Evening Shift
+1
-0

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

A
hypothesis
B
physical laws
C
theory
D
model
4
COMEDK 2021
+1
-0

Which of the following statement is incorrect?

A
Classical Physics deals with macroscopic phenomena and includes subject like mechanics, electrodynamics, optics and thermodynamics.
B
All Physics and also mathematics is based on assumptions each of which is variously called hypothesis or axiom or postulate etc.
C
A hypothesis is a supposition with assuming that is true.
D
An axiom is a self-evident truth, while a model is a theory proposed to explain observed phenomena.
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