- ✓$\frac{1}{2} CV ^2$
- B$CV ^2$
- C$\frac{C V^2}{3}$
- D$\frac{1}{2} QV ^2$
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The internal resistances of two cells shown are 0.1 Ω and 0.3 Ω. If R = 0.2 Ω, the potential difference across the cell
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(a) B will be zero |
(b) A will be zero |
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(c) A and B will be 2V |
(d) A will be > 2V and B will be < 2V |
Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is

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(a) |
(b) 4 |
(c) Zero |
(d) |
Assertion : A red object appears dark in the yellow light
Reason : A red colour is scattered less
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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. |
The de-Broglie wavelength of a particle moving with a velocity 2.25 × 108 m/s is equal to the wavelength of photon. The ratio of kinetic energy of the particle to the energy of the photon is (velocity of light is 3 × 108 m/s)
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(a) 1/8 |
(b) 3/8 |
(c) 5/8 |
(d) 7/8 |
The given figure represents a material which is

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(a) Paramagnetic |
(b) Diamagnetic |
(c) Ferromagnetic |
(d) None of these |
The phenomena involved in the reflection of radiowaves by ionosphere is similar to:
In a plano-convex lens the radius of curvature of the convex lens is 10 cm. If the plane side is polished, then the focal length will be (Refractive index = 1.5)
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(a) 10.5 cm |
(b) 10 cm |
(c) 5.5 cm |
(d) 5 cm |