Explanation:
In projectile motion, velocity is perpendicular to acceleration only at the highest point. Here, velocity is along the horizontal direction and acceleration is along the vertically downward direction.
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During a negative beta decay
|
(a) An atomic electron is ejected |
|
(b) An electron which is already present within the nucleus is ejected |
|
(c) A neutron in the nucleus decays emitting an electron |
|
(d) A part of the binding energy is converted into electron |
If 
and 
are respectively, the electric permittivity and the magnetic permeability of free space, ε and μ the corresponding quantities in a medium, the refractive index of the medium is
|
(a) |
(b) |
(c) |
(d) |
While using an electric bulb, the reflection for street lighting should be from
|
(a) Concave mirror |
(b) Convex mirror |
(d) Parabolic mirror |
(d) Parabolic mirror |
The angle between the earth's magnetic and the earth's geographical axes is
| (a) Zero | (b) 17° | (c) 23° | (d) None of these |
A square coil 
area is placed perpendicular to a uniform magnetic field of intensity 
. The magnetic flux through the coil is
|
(a) 10 weber |
(b) |
(c) |
(d) 100 weber |
A ray of light incident normally on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prism must be
|
(a) |
(b) |
(c) 1.5 |
(d) 2.0 |
