If an electron moves from rest from a point at which potential is 50 volt to another point at which potential is 70 volt, then its kinetic energy in the final state will be
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(a) 3.2 × 10–10 J |
(b) 3.2 × 10–18 J |
(c) 1 N |
(d) 1 dyne |
(b) 3.2 × 10–18 J
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In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be
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(a) 2 V |
(b) Less than 2 V |
(c) Zero |
(d) Greater than 2 V |
Which of the following figures correctly shows the phase relation between the input signal and the output signal of triode amplifier
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(a)
|
(b)
|
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(c)
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(d)
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A ray of light travels from a denser to a rarer medium then, the ray:
An iron rod of volume 
and relative permeability 1000 is placed inside a long solenoid wound with 5 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod is
|
(a) 10 |
(b) 15 |
(c) 20 |
(d) 25 |
If in a plano-convex lens, the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm, then the refractive index of the material of lens will be
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(a) 1.5 |
(b) 1.66 |
(c) 1.33 |
(d) 3 |
A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
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(a) Get deflected vertically upwards |
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(b) Move in a circular orbit with its speed increased |
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(c) Move in a circular orbit with its speed unchanged |
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(d) Continue to move due east |
Faraday’s 2nd law states that mass deposited on the electrode is directly proportional to
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(a) Atomic mass |
(b) Atomic mass × Velocity |
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(c) Atomic mass/Valency |
(d) Valency |
