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# VITEEE Physics Test - 6

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

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This mock test of VITEEE Physics Test - 6 for JEE helps you for every JEE entrance exam. This contains 40 Multiple Choice Questions for JEE VITEEE Physics Test - 6 (mcq) to study with solutions a complete question bank. The solved questions answers in this VITEEE Physics Test - 6 quiz give you a good mix of easy questions and tough questions. JEE students definitely take this VITEEE Physics Test - 6 exercise for a better result in the exam. You can find other VITEEE Physics Test - 6 extra questions, long questions & short questions for JEE on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

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

Solution:

Work function W0 = hc/λ

QUESTION: 3

### Intensity of X - rays in coolidge tube is controlled by

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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

Solution:

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

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

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QUESTION: 6

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

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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

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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

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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

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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

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QUESTION: 11

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

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QUESTION: 12

A choke coil has

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QUESTION: 13

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

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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

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QUESTION: 15

Which of the following electromagnetic waves have the smallest wavelength?

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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

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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

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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

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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

Solution:
QUESTION: 20

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

Solution:

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

QUESTION: 21
Five equal capacitors connected in series have a resultant capacitance of 4 $\mu$F. The total energy stored in these, when these are connected in parallel and charged to 400V is
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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

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QUESTION: 23

A chain reaction is fission of uranium is possible because

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QUESTION: 24

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

Solution:

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

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

Solution:
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
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QUESTION: 27
The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately
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QUESTION: 28

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

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QUESTION: 29
The formation of mirage is due to
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QUESTION: 30

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

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QUESTION: 31

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

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QUESTION: 32

The minimum potential difference between the base and emitter required to switch a silicon transistor 'ON' is approximately

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QUESTION: 33

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

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QUESTION: 34

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

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QUESTION: 35

If a full wave rectifier circuit is operating from 50 Hz, mains, the fundamental frequency in the ripple will be

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QUESTION: 36

A junction diode has a resistance of 25 Ω when forward biased and 2500 Ω when reverse biased. The current in the diode, for the arrangement shown will be

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QUESTION: 37

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

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QUESTION: 38

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

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QUESTION: 39

Huygen's wave theory of light can not explain

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QUESTION: 40

Young's double slit experiment gives interference fringes of width 0.3mm. A thin glass plate made of material of refractive index 1.5 is kept in the path of light from one of the slits, then the fringe width becomes

Solution: