An electron falls from rest through a vertical distance h in a un… - Vidyadip

MCQ

An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is:

A
Smaller.
B
5 times greater.
C
Equal.
D
10 times greater.

✓

Answer

Smaller.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q [1M]" from Electric Charges and Fields→Electric Charges and Fields — all question types→Physics STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

Dynamo core is laminated because

(a) Magnetic field increases

(b) Magnetic saturation level in core increases

(c) Residual magnetism in core decreases

(d) Loss of energy in core due to eddy currents decreases

When the P end of P-N junction is connected to the negative terminal of the battery and the N end to the positive terminal of the battery, then the P-N junction behaves like

(a) A conductor

(b) An insulator

(c) A super-conductor

(d) A semi-conductor

The antenna current of an AM transmitter is 8 A when only carrier is sent but increases to 8.96 A when the carrier is sinusoidally modulated. The percentage modulation is

(a) 50%

(b) 60%

(c) 65%

(d) 71%

Two capacitors each of capacity 2 μF are connected in parallel. This system is connected in series with a third capacitor of 12 μF capacity. The equivalent capacity of the system will be

(a) 16 μF

(b) 13 μF

(c) 4 μF

(d) 3 μF

Energy released in the fission of a single nucleus is 200 MeV. The fission rate of a fuelled reactor operating at a power level of 5W is

(a) 1.56

(b) 1.56

(c) 1.56

(d) 1.56

A student says that he had applied a force $\text{F}=-\text{k}\sqrt{\text{x}}$ on a particle and the particle moved in simple harmonic motion. He refuses to tell whether k is a constant or not. Assume that he was worked only with positive x and no other force acted on the particle.

As x increases k increases.
As x increases k decreases.
As x increases k remains constant.
The motion cannot be simple harmonic.

Two opposite charged particles oscillate about their mean equilibrium position in free space, with a frequency of 10⁹Hz. The wavelength of the corresponding electromagnetic wave produced is ______:

Bohr's atom model assumes

(a) The nucleus is of infinite mass and is at rest

(b) Electrons in a quantized orbit will not radiate energy

(c) Mass of electron remains constant

(d) All the above conditions

A charged particle moves in a gravity-free space without change in velocity. Which of the following is are possible:

$\text{E}=0,\ \text{B}=0$
$\text{E}=0,\ \text{B}\not=0$
$\text{E}\not=0,\ \text{B}=0$
$\text{E}\not=0,\ \text{B}\not=0$

An optically active compound

(a) Rotates the plane polarised light

(b) Changing the direction of polarised light

(c) Do not allow plane polarised light to pass through

(d) None of the above