- AMagnitude of charge.
- BDirection of charge.
- CPolarity of charge.
- DNone.
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4 eV is the energy of the incident photon and the work function in 2eV. What is the stopping potential
|
(a) 2V |
(b) 4V |
(c) 6V |
(d) 2 |
X-rays of wavelength 0.1 Å allowed to fall on a metal get scattered. The wavelength of scattered radiation is 0.111 Å. If h = 6.624 × 10–34 J-s and m0 = 9 × 10–31 kg, then the direction of the scattered photons will be
| (a) cos–1 (0.547) | (b) cos–1 (0.4484) | (c) cos–1 (0.5) | (d) cos–1 (0.3) |
Source of Sun's energy is
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(a) Burning of hydrogen |
(b) Fission reactions involving hydrogen |
|
(c) Fusion reactions involving hydrogen |
(d) Some other source |
Assertion : Soft iron is used as a core of transformer.
Reason : Area of hysteresis is loop for soft iron is small.
|
(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. |
Force acting upon a charged particle kept between the plates of a charged condenser is F. If one plate of the condenser is removed, then the force acting on the same particle will become
|
(a) 0 |
(b) F/2 |
(c) F |
(d) 2F |
The hyper-metropia is a
|
(a) Short-side defect |
(b) Long- side defect |
|
(c) Bad vision due to old age |
(d) None of these |