- ACircular
- BSpherical
- CCylindrical
- DPlane
Explanation:
Due to the large distance, the radius of the wavefront can be considered as large (infinity) and hence, a wavefront is almost plane.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Fission of nuclei is possible because the binding energy per nucleon in them
|
(a) Increases with mass number at high mass numbers |
|
(b) Decreases with mass number at high mass numbers |
| (c) Increases with mass number at low mass numbers |
| (d) Decreases with mass number at low mass numbers |
If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a
|
(a) Current drop |
(b) Potential drop |
(c) No current drop |
(d) No potential drop |
The error in measuring the current with a tangent galvanometer is minimum when the deflection is about
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 60o |
According to Bohr's theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional to
|
(a) |
(b) |
(c) |
(d) |
Light of frequency n is incident on a substance of threshold frequency n0(n0 < n). The energy of the emitted photo-electron will be
|
(a) |
(b) h/v |
(c) |
(d) |
For which of the following colour, the magnifying power of a microscope will be maximum
|
(a) White colour |
(b) Red colour |
(c) Violet colour |
(d) Yellow colour |
The relation between voltage sensitivity () and current sensitivity (
) of a moving coil galvanometer is (Resistance of Galvanometer = G)
|
(a) |
(b) |
(c) |
(d) |
A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field . The torque acting on the coil is
|
(a) 0.32 Nm tending to rotate the side AD out of the page |
|
(b) 0.32 Nm tending to rotate the side AD into the page |
|
(c) 0.0032 Nm tending to rotate the side AD out of the page |
|
(d) 0.0032 Nm tending to rotate the side AD into the page |