1
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The closest approach of an alpha particle when it make a head on collision with a gold nucleus is $$10 \times 10^{-14} \mathrm{~m}$$, then the kinetic energy of the alpha particle is :

A
3640 J
B
3.64 J
C
$$ 3.64 \times 10^{-16} \mathrm{~J} $$
D
$$ 3.64 \times 10^{-13} \mathrm{~J} $$
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A one $\mathrm{kg}$ block of ice at $$-1.5^{\circ} \mathrm{C}$$ falls from a height of $$1.5 \mathrm{~km}$$ and is found melting. The amount of ice melted due to fall, if $$60 \%$$ energy is converted into heat is (Specific heat capacity of ice is $$0.5 \mathrm{~cal} \mathrm{~g}^{-1} \mathrm{~C}^{-1}$$, Latent heat of fusion of ice $$=80 \mathrm{~cal~g}^{-1}$$ )

A
1.69 g
B
10 g
C
16.9 g
D
17.9 g
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

64 rain drops of the same radius are falling through air with a steady velocity of $$0.5 \mathrm{~cm} \mathrm{~s}^{-1}$$. If the drops coalesce, the terminal velocity would be

A
$$1.25 \mathrm{~cm} \mathrm{~s}^{-1}$$
B
$$0.08 \mathrm{~ms}^{-1}$$
C
$$0.8 \mathrm{~ms}^{-1}$$
D
$$1.25 \mathrm{~ms}^{-1}$$
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The capacitance of a parallel plate capacitor is $$400 \mathrm{~pF}$$. It is connected to an ac source of $$100 \mathrm{~V}$$ having an angular frequency $$100 \mathrm{~rad~s}^{-1}$$. If the rms value of the current is $$4 \mu \mathrm{A}$$, the displacement current is:

A
$$4 \times 10^{-2} \mu \mathrm{A}$$
B
0.4 $$\mu$$A
C
4 $$\mu$$A
D
4 A
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