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

The power of a gun which fires 120 bullet per minute with a velocity $$120 \mathrm{~ms}^{-1}$$ is : (given the mass of each bullet is $$100 \mathrm{~g}$$)

A
86400 W
B
14.4 kW
C
1.44 kW
D
1220 W
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The width of the fringes obtained in the Young's double slit experiment is $$2.6 \mathrm{~mm}$$ when light of wave length $$6000^{\circ} \mathrm{A}$$ is used. If the whole apparatus is immersed in a liquid of refractive index 1.3 the new fringe width will be :

A
2.6 mm
B
5.2 mm
C
2 mm
D
4 mm
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

An electric bulb of volume $$300 \mathrm{~cm}^3$$ was sealed off during manufacture at a pressure of $$1 \mathrm{~mm}$$ of mercury at $$27{ }^{\circ} \mathrm{C}$$. The number of air molecules contained in the bulb is, $$(\mathrm{R}=8.31 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$$ and $$N_A=6.02 \times 10^{23})$$

A
$$9.67 \times 10^{16}$$
B
$$9.65 \times 10^{15}$$
C
$$9.67 \times 10^{17}$$
D
$$9.65 \times 10^{18}$$
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Find the binding energy of the tritium nucleus: [Given: mass of $$1 \mathrm{H}^3=3.01605 \mathrm{~u} ; \mathrm{~m}_{\mathrm{p}}=1.00782 \mathrm{~u} ; \mathrm{~m}_{\mathrm{n}}=1.00866 \mathrm{~u}$$.]

A
8.5 MeV
B
8.5 J
C
0.00909 MeV
D
0.00909 eV
EXAM MAP