- A$10\mu\text{F}$
- B$15\mu\text{F}$
- C$20\mu\text{F}$
- D$\text{None of these}$
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At the magnetic north pole of the earth, the value of horizontal component of earth's magnetic field and angle of dip are, respectively
| (a) Zero, maximum | (b) Maximum, minimum |
| (c) Maximum, maximum | (d) Minimum, minimum |
A straight wire carrying a current 10 A is bent into a semicircular arc of radius 5 cm. The magnitude of magnetic field at the center is
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(a) 1.5 |
(b) 3.14 |
(c) 6.28 |
(d) 19.6 |
Assertion : For the scattering of a-particles at a large angles, only the nucleus of the atom is responsible.
Reason : Nucleus is very heavy in comparison to electrons.
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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. |
Which one of the following planet has the longest day
|
(a) Venus |
(b) Mars |
(c) Mercury |
(d) Earth |
How should people wearing spectacles work with a microscope?
A current i ampere flows in a circular arc of wire whose radius is R, which subtend an angle 3π/2 radian at its centre. The magnetic induction B at the centre is

|
(a) |
(b) |
(c) |
(d) |