1
WB JEE 2017
MCQ (Single Correct Answer)
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Consider the circuit shown in the figure.

WB JEE 2017 Physics - Current Electricity Question 24 English
The value of the resistance X for which the thermal power generated in it is practically independent of small variation of its resistance is
A
X = R
B
X = $${R \over 3}$$
C
X = $${R \over 2}$$
D
X = 2R
2
WB JEE 2017
MCQ (Single Correct Answer)
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WB JEE 2017 Physics - Current Electricity Question 23 English
Consider the circuit shown in the figure where all the resistances are of magnitude 1 k$$\Omega$$. If the current in the extreme right resistance X is 1 mA, the potential difference between A and B is
A
34 V
B
21 V
C
68 V
D
55 V
3
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
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The ratio of the diameter of the sun to the distance between the earth and the sun is approximately 0.009. The approximate diameter of the image of the sun formed by concave spherical mirror of radius of curvature 0.4 m is
A
4.5 $$ \times $$ 10$$-$$6 m
B
4.0 $$ \times $$ 10$$-$$6 m
C
3.6 $$ \times $$ 10$$-$$3 m
D
1.8 $$ \times $$ 10$$-$$3 m
4
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
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Two monochromatic coherent light beams A and B have intensities L and $${{L \over 4}}$$, respectively. If these beams are superposed, the maximum and minimum intensities will be
A
$${{{9L} \over 4},{L \over 4}}$$
B
$${{{5L} \over 4}}$$ , 0
C
$${{{5L} \over 2}}$$ , 0
D
2L, $${{L \over 2}}$$
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