- ✓$ML^{2}T^{-2}A^{-2}$
- B$ML^{2}T^{2}A^{2}$
- C$ML^{2}T^{-2}A^{2}$
- DNone of these
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If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm, then the refractive index of the material of lens will be
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(a) 1.5 |
(b) 1.66 |
(c) 1.33 |
(d) 3 |
Assertion : An N-type semiconductor has a large number of electrons but still it is electrically neutral.
Reason : An N-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A convex lens of power + 6D is placed in contact with a concave lens of power – 4D. What is the nature and focal length of the combination
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(a) Concave, 25 cm |
(b) Convex, 50 cm |
(c) Concave, 20 cm |
(d) Convex, 100 cm |
In the arrangement of resistances shown below, the effective resistance between points A and B is
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(a) 20 Ω |
(b) 30 Ω |
(c) 90 Ω |
(d) 110 Ω |
A straight conductor of length 0.4 m is moved with a speed of 7 m/s perpendicular to the magnetic field of intensity of 0.9 Wb/m2. The induced e.m.f. across the conductor will be
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(a) 7.25 V |
(b) 3.75 V |
(c) 1.25 V |
(d) 2.52 V |