Explanation:
Inside a uniform spherical shell, the gravitational field is the same everywhere and is equal to zero. The gravitational potential has a constant value inside a uniform spherical shell.
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At what temperature will the resistance of a copper wire become three times its value at 0 oC (Temperature coefficient of resistance for copper = 4 × 10–3 per oC )
|
(a) 400 oC |
(b) 450 oC |
(c) 500 oC |
(d) 550 oC |
Ratio of magnetic intensities for an axial point and a point on broad side-on position at equal distance d from the centre of magnet will be or The magnetic field at a distance d from a short bar magnet in longitudinal and transverse positions are in the ratio
| (a) 1 : 1 | (b) 2 : 3 | (c) 2 : 1 | (d) 3 : 2 |
Six equal resistances are connected between points P, Q and R as shown in the figure. Then the net resistance will be maximum between
|
(a) P and Q |
(b) Q and R |
(c) P and R |
(d) Any two points |
Television signals on earth cannot be received at distances greater than 100 km from the transmission station. The reason behind this is that
|
(a) The receiver antenna is unable to detect the signal at a distance greater than 100 km |
|
(b) The TV programme consists of both audio and video signals |
|
(c) The TV signals are less powerful than radio signals |
|
(d) The surface of earth is curved like a sphere |
In Young's double slit experiment how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe if λ = 2000
and d = 7000
|
(a) 12 |
(b) 7 |
(c) 18 |
(d) 4 |
The equivalent inductance of two inductances is 2.4 henry when connected in parallel and 10 henry when connected in series. The difference between the two inductances is
|
(a) 2 henry |
(b) 3 henry |
(c) 4 henry |
(d) 5 henry |
Magnetic moments of two bar magnets may be compared with the help of
| (a) Deflection magnetometer | (b) Vibration magnetometer |
| (c) Both of the above | (d) None of the above |
In Young’s double-slit experiment, an interference pattern is obtained on a screen by a light of wavelength 6000 Å, coming from the coherent sources S1 and S2. At certain point P on the screen third dark fringe is formed. Then the path difference S1P – S2P in microns is
|
(a) 0.75 |
(b) 1.5 |
(c) 3.0 |
(d) 4.5 |