A parallel plate capacitor has capacitance C. If it is equally filled with parallel layers of materials of dielectric constants K1 and K2 its capacity becomes C1. The ratio of C1 to C is
|
(a) |
(b) |
(c) |
(d) |
(d) 
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A circular coil ‘A’ has a radius R and the current flowing through it is I. Another circular coil ‘B’ has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of (i.e. 
to
)
|
(a) 4 : 1 |
(b) 2 : 1 |
(c) 3 : 1 |
(d) 1 : 1 |
The refractive index of a material of a prism of angles 45°– 45° – 90° is 1.5. The path of the ray of light incident normally on the hypotenuse side is shown in
|
(a)
|
(b)
|
(b)
|
(d)
|
Variation of current and voltage in a conductor has been shown in the diagram below. The resistance of the conductor is
|
(a) 4 ohm |
(b) 2 ohm |
(c) 3 ohm |
(d) 1 ohm |
Consider the following two statements A and B and identify the correct choice in the given answer
A : The characteristic X-ray spectrum depends on the nature of the material of the target.
B : The short wavelength limit of continuous X-ray spectrum varies inversely with the potential difference applied to the X-rays tube
|
(a) A is true and B is false |
(b) A is false and B is true |
|
(c) Both A and B are true |
(d) Both A and B are false |
The charge given to a hollow sphere of radius 10 cm is 3.2 × 10–19 coulomb. At a distance of 4 cm from its centre, the electric potential will be
|
(a) 28.8 × |
(b) 288 volts |
(c) 2.88 volts |
(d) Zero |
Refractive index of glass is 
and refractive index of water is 
. If the speed of light in glass is 2.00 
m/s, the speed in water will be
|
(a) 2.67 |
(b) 2.25 |
(c) 1.78 |
(d) 1.50 |
The horizontal component of the earth's magnetic field is 0.22 Gauss and total magnetic field is 0.4 Gauss. The angle of dip. is
|
(a) |
(b) |
(c) |
(d) |
