If two streams of protons move parallel to each other in the same direction, then they
|
(a) Do not exert any force on each other |
|
(b) Repel each other |
|
(c) Attract each other |
|
(d) Get rotated to be perpendicular to each other |
(b) Repel each other
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Two parallel plates separated by a distance of 5mm are kept at a potential difference of 50 V. A particle of mass 
and charge 
enters in it with a velocity 
. The acceleration of the particle will be
|
(a) |
(b) |
(c) |
(d) 2 |
The maximum focal length of the eye-lens of a person is greater than its distance from the retina. The eye is:
The direction of ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4 (Fig). Which of the four rays correctly shows the direction of reflected ray?
Angular width of central maxima in the Fraunhoffer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength 6000 Å. When the slit is illuminated by light of another wavelength, the angular width decreases by 30%. The wavelength of this light will be
|
(a) 6000 Å |
(b) 4200 Å |
(c) 3000 Å |
(d) 1800 Å |
The same mass of copper is drawn into two wires 1 mm and 2 mm thick. Two wires are connected in series and current is passed through them. Heat produced in the wire is in the ratio
|
(a) 2 : 1 |
(b) 1 : 16 |
(c) 4 : 1 |
(d) 16 : 1 |
A man cannot see clearly the objects beyond a distance of 20 cm from his eyes. To see distant objects clearly he must use which kind of lenses and of what focal length
|
(a) 100 cm convex |
(b) 100 cm concave |
(c) 20 cm convex |
(d) 20 cm concave |
