1
JEE Main 2022 (Online) 28th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A transformer operating at primary voltage $$8 \,\mathrm{kV}$$ and secondary voltage $$160 \mathrm{~V}$$ serves a load of $$80 \mathrm{~kW}$$. Assuming the transformer to be ideal with purely resistive load and working on unity power factor, the loads in the primary and secondary circuit would be

A
$$800 \,\Omega$$ and $$1.06 \,\Omega$$
B
$$10 \,\Omega$$ and $$500 \,\Omega$$
C
$$800 \,\Omega$$ and $$0.32 \,\Omega$$
D
$$1.06 \,\Omega$$ and $$500 \,\Omega$$
2
JEE Main 2022 (Online) 28th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Sun light falls normally on a surface of area $$36 \mathrm{~cm}^{2}$$ and exerts an average force of $$7.2 \times 10^{-9} \mathrm{~N}$$ within a time period of 20 minutes. Considering a case of complete absorption, the energy flux of incident light is

A
$$25.92 \times 10^{2} \mathrm{~W} / \mathrm{cm}^{2}$$
B
$$8.64 \times 10^{-6} \mathrm{~W} / \mathrm{cm}^{2}$$
C
$$6.0 \mathrm{~W} / \mathrm{cm}^{2}$$
D
$$0.06\mathrm{~W} / \mathrm{cm}^{2}$$
3
JEE Main 2022 (Online) 28th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The power of a lens (biconvex) is $$1.25 \mathrm{~m}^{-1}$$ in particular medium. Refractive index of the lens is 1.5 and radii of curvature are $$20 \mathrm{~cm}$$ and $$40 \mathrm{~cm}$$ respectively. The refractive index of surrounding medium:

A
1.0
B
$$\frac{9}{7}$$
C
$$\frac{3}{2}$$
D
$$\frac{4}{3}$$
4
JEE Main 2022 (Online) 28th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Two streams of photons, possessing energies equal to five and ten times the work function of metal are incident on the metal surface successively. The ratio of maximum velocities of the photoelectron emitted, in the two cases respectively, will be

A
1 : 2
B
1 : 3
C
2 : 3
D
3 : 2
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