When a white light passes through a hollow prism, then
|
(a) There is no dispersion and no deviation |
(b) Dispersion but no deviation |
|
(c) Deviation but no dispersion |
(d) There is dispersion and deviation both |
(a) There is no dispersion and no deviation
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
When a dielectric material is introduced between the plates of a charged condenser then electric field between the plates
|
(a) Decreases |
(b) Increases |
(c) Remain constant |
(d) First (b) then (a) |
The intensity distribution of X-rays from two coolidge tubes operated on different voltages V1 and V2 and using different target materials of atomic numbers Z1 and Z2 is shown in the figure. Which one of the following inequalities is true?
|
(a) V1 > V2, Z1 < Z2 |
(b) V1 > V2, Z1 > Z2 |
(c) V1 < V2, Z1 > Z2 |
(d) V1 = V2, Z1 < Z2 |
A bar magnet of length 3 cm has points A and B along its axis at distances of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be
|
(a) 8 |
(b) 1/2 |
(c) 3 |
(d) 4 |
A magnet freely suspended in a vibration magnetometer makes 10 oscillations per minute at a place A and 20 oscillations per minute at a place B. If the horizontal component of earth’s magnetic field at A is 36 
, then its value at B is
|
(a) 36 × 10–6 T |
(b) 72 × 10–6 T |
(c) 144 × 10–6 T |
(d) 288 × 10–6 T |
n equal resistors are first connected in series and then connected in parallel. What is the ratio of the maximum to the minimum resistance
|
(a) n |
(b) |
(c) |
(d) |
A coil has an area of 0.05 m2 and it has 800 turns. It is placed perpendicularly in a magnetic field of strength 4 
, it is rotated through 90° in 0.1 sec. The average e.m.f. induced in the coil is
|
(a) 0.056 V |
(b) 0.046 V |
(c) 0.026 V |
(d) 0.016 V |
If the amplitude ratio of two sources producing interference is 3 : 5, the ratio of intensities at maxima and minima is
|
(a) 25 : 16 |
(b) 5 : 3 |
(c) 16 : 1 |
(d) 25 : 9 |
