The electric field associated with an e.m. wave in vacuum is given by
The electric field associated with an e.m. wave in vacuum is given by E = i 40 cos (kz – 6 x 10⁸ t), where E, z and t are in volt/m, meter and seconds […]
AIPMT2012
An alternating electric field, of frequency v, is applied across the dees (radius = R)
An alternating electric field, of frequency v, is applied across the dees (radius = R) of a cyclotron that is being used to accelerate protons (mass = m). The operating magnetic field (B) used in […]
A compass needle which is allowed to move in a horizontal plane
A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole It:
Options
(a) will become rigid showing no movement (b) will stay in any position […]
The case of adsorption of the hydrated alkali metal ions on an ion-exchange
The case of adsorption of the hydrated alkali metal ions on an ion-exchange resins follows the order:
Options
(a) Li⁺ < K⁺ < Na⁺ < Rb⁺ (b) Rb⁺ < K⁺ < Na⁺ < […]
Which one of the alkali metals, forms only, the normal oxide, M₂O on heating
Which one of the alkali metals, forms only, the normal oxide, M₂O on heating in air
Options
(a) Rb (b) K (c) Li (d) Na
Correct Answer:
Li
Explanation:
When alkali metals heated […]
A concave mirror of focal length f₁ is placed at a distance d from a convex lens
A concave mirror of focal length f₁ is placed at a distance d from a convex lens of focal length f₂. A beam of light coming from infinity and falling on this convex lens concave […]
A ray of light is incident at an angle of incidence i, on one face of a prism
A ray of light is incident at an angle of incidence i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive […]
The magnifying power of a telescope is 9. When it is adjusted for parallel rays
The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of lenses are:
Options
(a) […]
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts a plane sheet of glass. This implies that the liquid must have refractive index
Options
(a) […]
Which one of the following statements regarding photochemical smog is not correct
Which one of the following statements regarding photochemical smog is not correct
Options
(a) Carbon monoxide does not play any role in photochemical smog formation (b) Photochemical smong is an oxidising agent in […]