1
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

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

A
hypothesis
B
physical laws
C
theory
D
model
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Find the pole strength of a magnet of length $$2 \mathrm{~cm}$$, if the magnetic field strength $B$ at distance $$10 \mathrm{~cm}$$ from the centre of a magnet on the axial line of the magnet is $$10^{-4} \mathrm{~T}$$.

A
$$25 \mathrm{~Am}$$
B
$$100 \mathrm{~Am}$$
C
$$5 \times 10^{-2} \mathrm{~Am}$$
D
$$1 \times 10^{-4} \mathrm{~Am}$$
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the head-on collision of two alpha particles $$\alpha_1$$ and $$\alpha_2$$ with the gold nucleus, the closest approaches are 31.4 fermi and 94.2 fermi respectively. Then the ratio of the energy possessed by the alpha particles $$\alpha_2 / \alpha_1$$ is:

A
$$1: 3$$
B
$$9: 1$$
C
$$3: 1$$
D
$$1: 9$$
4
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Two black bodies $$\mathrm{P}$$ and $$\mathrm{Q}$$ have equal surface areas and are kept at temperatures $$127^{\circ} \mathrm{C}$$ and $$27^{\circ} \mathrm{C}$$ respectively. The ratio of thermal power radiated by A to that by B is

A
$$81: 256$$
B
$$177: 127$$
C
$$127: 177$$
D
$$256: 81$$
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