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VITEEE Physics Test - 6


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35 Questions MCQ Test VITEEE: Subject Wise and Full Length MOCK Tests | VITEEE Physics Test - 6

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VITEEE Physics Test - 6 - Question 1

A LC circuit is in the state of resonance. If C = 0.1μF and L = 0.25 henry. Neglecting ohmic resistance of circuit what is the frequency of oscillations

Detailed Solution for VITEEE Physics Test - 6 - Question 1

From the formula, the frequency of oscillation is
f=1/2π(LC)1/2​
=1/2π(0.25×0.1×10−6​)1/2
=1007Hz

VITEEE Physics Test - 6 - Question 2

The photoelectic work function for a metal surface is 4.125eV. The cut-off wave length for this surface is

Detailed Solution for VITEEE Physics Test - 6 - Question 2

Work function W0 = hc/λ

 

VITEEE Physics Test - 6 - Question 3

Intensity of X - rays in coolidge tube is controlled by

VITEEE Physics Test - 6 - Question 4

An air capacitor of capacity C = 10μ F is connected to a constant voltage battery of 12 volt. Now the space between the plates is filled with a liquid of dielectric constant 5. The charge that flows now from battery to the capacitor is

Detailed Solution for VITEEE Physics Test - 6 - Question 4

C = 10 μ F
Charge in capacitor q = CV
= 10 x 12
= 120 μ C
On keeping liquid of dielectric constant5, capacity will becomes of 5 time.
∴ Charge q = 5 x 120
= 600 μ C

VITEEE Physics Test - 6 - Question 5

If a cell of constant electromotive force produces the same amount of heat during the same time in two independent resistances R₁ and R₂, when connected separately one after the other, across the cell, then the internal resistance of the cell is

VITEEE Physics Test - 6 - Question 6

Consider telecommunication through optical fibres. Which of the following statements is not correct

VITEEE Physics Test - 6 - Question 7

Three unequal resistors in parallel are equivalent to a resistance 1 ohm. If two of them are in the ratio 1:2 and if no resistance value is fractional, the largest of the three resistances in ohms is

VITEEE Physics Test - 6 - Question 8

A steady current is passing through a conductor of non-uniform cross-section. The net quantity of charge crossing any cross-section per second is

VITEEE Physics Test - 6 - Question 9

Three unequal resistors in parallel are equivalent to resistance 1 Ω . If two of them are in the ratio 1 : 2 and if no resistance value is fractional, the largest of the three resistances in ohms is

VITEEE Physics Test - 6 - Question 10

The temperature coefficient of a resistance wire is 0.00125 per degree. The resistance at 300 K is 1 ohm. At what temperature its resistance will be 2 ohm, at

VITEEE Physics Test - 6 - Question 11

An electron and a proton have same de-Broglie's wavelength. The kinetic energy of an electron is

VITEEE Physics Test - 6 - Question 12

A choke coil has

VITEEE Physics Test - 6 - Question 13

Lenz's law is a consequence of the law of conservation of

VITEEE Physics Test - 6 - Question 14

If 2.2 kW power is transmitted through a 10 Ω line at 22000 V, the power loss in the form of heat will be

VITEEE Physics Test - 6 - Question 15

Which of the following electromagnetic waves have the smallest wavelength?

VITEEE Physics Test - 6 - Question 16

n small drops of same size are charged to V volt each. They coalesce to form a bigger drop. The potential of the bigger drop is

VITEEE Physics Test - 6 - Question 17

Two equal charges, q each are placed at a distance of 2a, and a third charge -2q is placed at the mid point. The potential energy of the system is

VITEEE Physics Test - 6 - Question 18

An infinite no. of capacitors with capacitances 1μF, 1/21μF, 1/41μF, 1/81μF, ...etc. are connected in parallel combination. Their equivalent capcitance will be

VITEEE Physics Test - 6 - Question 19

Two charges 8C and 6C are placed with a distance of separation d between them and exert a force of magnitude F on each other. If a charge - 4C is added to each of these and they brought nearer by a distance d/3, the magnitude of force between them will be

VITEEE Physics Test - 6 - Question 20

A charge q is placed at the corner of a cube of side l. The electric flux passing through the cube is

Detailed Solution for VITEEE Physics Test - 6 - Question 20

Eight cubes, each side l, are required to form a Gaussian surface
So that the charge q at the corner of a small cube appears at the centre of the bigger cube
According to Gauss's law, the electric flux through the bigger cubes = q/∈0 
Hence the electric flux through the given small cube = q/8∈0 

VITEEE Physics Test - 6 - Question 21
Five equal capacitors connected in series have a resultant capacitance of 4 μ F. The total energy stored in these, when these are connected in parallel and charged to 400V is
VITEEE Physics Test - 6 - Question 22

A charged particle is moving with velocity ν̅ in a magnetic field of induction B̅. The force on the particle will be maximum when

VITEEE Physics Test - 6 - Question 23

A chain reaction is fission of uranium is possible because

VITEEE Physics Test - 6 - Question 24

Two nuclei have their mass numbers in the ratio of 1:3 . The ratio of their nuclear densities would be

Detailed Solution for VITEEE Physics Test - 6 - Question 24

The nuclear density does not depend on mass numbers
So it can, safely, be concluded that for all nuclei possess nearly the same density

VITEEE Physics Test - 6 - Question 25

A radio active sample has a half life of 5 days. To decay from 8 micro curies to 1 micro-curie, the number of days taken will be

VITEEE Physics Test - 6 - Question 26
Light of wavelength λ and photon energy 2 eV falling on a metal surface produces photoelectrons of maximum velocity ν. If λ is decreased by 25% and the maximum velocity is doubled, the work function of metal (in eV) is
VITEEE Physics Test - 6 - Question 27

A ray of light passes through an equilateral prism such that the angle of incidence is equal to the angle of emergence and the latter is equal to 3/4 the angle of prism. The angle of deviation is

VITEEE Physics Test - 6 - Question 28
The formation of mirage is due to
VITEEE Physics Test - 6 - Question 29

The electric circuit used to get smooth d.c. output from a rectifier circuit is called

VITEEE Physics Test - 6 - Question 30

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength:

VITEEE Physics Test - 6 - Question 31

If no external voltage is applied across P-N junction, there would be

VITEEE Physics Test - 6 - Question 32

When a P-N junction diode is reverse biased, the flow of current across the junction is mainly due to

VITEEE Physics Test - 6 - Question 33

Bubble's of colourless soap solution appear coloured in sun light. This is due to

VITEEE Physics Test - 6 - Question 34

When light wave suffer reflection at the interface between air and glass, the change of phase of reflected wave is equal to

VITEEE Physics Test - 6 - Question 35

Huygen's wave theory of light can not explain

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