When two magnetic moments are compared using equal distance method the deflections produced are 45o and 30o. If the length of magnets are in the ratio 1 : 2, the ratio of their pole strengths is
|
(a) 3 : 1 |
(b) 3 : 2 |
(c) |
(d) 2 |
(d) 2
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The equivalent quantity of mass in electricity is
|
(a) Charge |
(b) Potential |
(c) Inductance |
(d) Current |
(1) The product of a volt and a coulomb is a joule.
(2) The product of a volt and an ampere is a joule/second.
(3) The product of volt and watt is horse power.
(4) Watt-hour can be measured in terms of electron volt.
State if
|
(a) All four are correct |
(b) (1), (2) and (4) are correct |
|
(c) (1) and (3) are correct |
(d) (3) and (4) are correct |
Assertion : Blue colour of sky appears due to scattering of blue colour.
Reason : Blue colour has shortest wave length in visible spectrum.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
A point source of light is placed in front of a plane mirror:
A double convex lens of focal length 20 cm is made of glass of refractive index 3 / 2. When placed completely in water (a
, its focal length will be
|
(a) 80 cm |
(b) 15 cm |
(c) 17.7 cm |
(d) 22.5 cm |
The diagram shows-the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy
| (a) I | (b) II | (c) III | (d) IV |