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# VITEEE Physics Test - 2

## 40 Questions MCQ Test VITEEE: Subject Wise and Full Length MOCK Tests | VITEEE Physics Test - 2

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This mock test of VITEEE Physics Test - 2 for JEE helps you for every JEE entrance exam. This contains 40 Multiple Choice Questions for JEE VITEEE Physics Test - 2 (mcq) to study with solutions a complete question bank. The solved questions answers in this VITEEE Physics Test - 2 quiz give you a good mix of easy questions and tough questions. JEE students definitely take this VITEEE Physics Test - 2 exercise for a better result in the exam. You can find other VITEEE Physics Test - 2 extra questions, long questions & short questions for JEE on EduRev as well by searching above.
QUESTION: 1

### The average power dissipation in pure inductance is

Solution:

Solution :- power =1/T ∫v(t)i(t)dt

In sinusoidal wave, V and I differ by 90 °

Pa=ω2π∫Aωsin(ωt)cos(ωt)dt

where A is a constant depending on the value of the inductance L or capacitance C of the component.

P=Aω²/2π  [ ∫2π/sin(2ωt)dt]

period of sin(2ωt) is T′=π/ω

interval of integration of P is exactly two periods of sin(2ωt)

so finally :

P=Aω²/2π∫sin(2ωt)dt=0

QUESTION: 2

### Moseley's law states that

Solution:

The frequency of characteristic X-ray spectral line is directly proportional to the square of atomic number of target element.
⇒ v ∝ Z2 i . e . √ v ∝ Z
or √ v = a (z − b)
Here a is constant of proportionality b is screening constant.

QUESTION: 3

### In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is

Solution:
QUESTION: 4

Emission of electrons in the photoelectric effect is possible, if

Solution:
QUESTION: 5

A sheet of aluminium is inserted in the air gap between the parallel plate capacitor, without touching any the two plates of the capacitor. The capacitance the capacitor is:

Solution:
QUESTION: 6

When a current is passed through water acidified with a dilute sulphuric acid, the gases formed at the platinum electrodes are

Solution:
QUESTION: 7

The resistance of a coil at 100oC is 4.2 Ω. If temperature coefficient of resistance of the coil material is 0.004oC-1, then its resistance at 0oC is

Solution:

Solution :- Emf, e = 20sin300t

Current, i = 4sin300t

Reactance, R = emf/I

R = 20/4

​ =5ohm

QUESTION: 8

The internal resistance of a cell of e.m.f. 3 V is 0.1 Ω, If it is connected to a resistance of 2.9Ω then voltage across the cell will be

Solution:
QUESTION: 9

In short wave communication waves of which of the following frequencies will be reflected back by the ionospheric layer having electron density 1011 per m-3?

Solution: QUESTION: 10

A particle with a specific charge S is fired with a speed v towards a wall at a distance d, perpendicular to the wall. What minimum magnetic field must exist in this region for particle not hit the wall ?

Solution:

The particle moves in a circular path with radius d if it is just to miss the wall
mv = Bqr
⇒ B = v ( q m ) d = v sd

QUESTION: 11

When a current flows in a wire, there exists an electric field whose direction is

Solution:

Solution :- The current always flows in the same direction as the electric field. The electrons flow in the opposite direction, because they are negatively charged.

QUESTION: 12

A generator at a utility company produces 100 A of current at 4000 V. The voltage is stepped up to 240000 V by a transformer before it is sent on a high voltage transmission line. The current in transmission line is

Solution:
QUESTION: 13

A step-up transformer has transformation ratio of 3:2 What is the voltage in secondary, if voltage in primary is 30 V ?

Solution: QUESTION: 14

The coefficient of mutual inductance, when magnetic flux changes by 2 X 10-2 Wb and current changes by 0.01 A is

Solution:
QUESTION: 15

A point charge q is placed at a distance a/2 directly above the centre of a square of side a. The electric flux through the square assuming it to be one face of the cube is

Solution:
QUESTION: 16

Which of the following waves have the maximum wavelength?

Solution:
QUESTION: 17

A 2 μ F condenser is charged to 500V and then its plates are joined through of consistance. The heat produced in the resistance in joules is

Solution:
QUESTION: 18
Equal charges are given to two conducting spheres of different radii. The potential will
Solution:
QUESTION: 19

If a point charge q be rotated in a circle of radius r around a charge Q, the work done will be

Solution:
QUESTION: 20

The electric potential at a point (x, y) in the xy-plane is given by: V=-kxy. The electric field intensity at a distance r from the origin varies as

Solution:
QUESTION: 21

An electric dipole of dipole moment p is placed in uniform electric field of strength E. If θ is the angle between p and E, then potential energy of the dipole becomes maximum, when θ is

Solution:
QUESTION: 22
A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The magnetic field far away will be
Solution:
QUESTION: 23
The reason for the continuous emission of energy by the sun is
Solution:
QUESTION: 24

In the following reaction, the energy released is Solution:
QUESTION: 25

A radioactive element has a half life of 15 years. The fraction that will decay in 30 years is

Solution:
QUESTION: 26

The photoelectric threshold of a certain metal is 30 Å. If the radiation of 2000 Å is incident on the metal

Solution:
QUESTION: 27

Illusion in deserts is due to

Solution:
QUESTION: 28

A double convex lens made of air with both radii of curvature being 10 cm is placed in a medium of refractive index 1.5. The focal length and nature of lens is

Solution:
QUESTION: 29

In comparison to a half wave rectifier, the full wave rectifier gives lower

Solution:
QUESTION: 30

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

Solution:
QUESTION: 31

The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is

Solution:

Solution :- Current gain of transistor is

α = ΔIC/ΔiE

Where ΔiC is change in collector current, and ΔiE is change in emitter current.

Given, α=0.96,ΔiE=7.2,

ΔiC=0.96×7.2=6.91mA

Also ΔiE=ΔiC+ΔiB

∴ ΔiB = ΔiE + ΔiC

= 7.2−6.91 = 0.29mA

QUESTION: 32

When the conductivity of a semiconductor is only due to breaking of covalent bonds, the semiconductor is called

Solution:
QUESTION: 33

To obtain electrons as majority charge carriers in a semiconductor, the impurity mixed is

Solution:
QUESTION: 34

The impurity atom that should be added to the germanium to make it an n-type semiconductor, is

Solution:
QUESTION: 35
P-N junction is said to be forward biased, when
Solution:
QUESTION: 36

In Young's double slit experiment, an interference pattern is obtained on a screen by a light of wavelength 6000 Å coming from the coherent sources S1 and S2. At certain point P on the screen third dark fringe is formed. Then the path difference S1 p − S2p in microns is

Solution:
QUESTION: 37

The phase difference between any two points on a wavefront is

Solution:
QUESTION: 38

A ray of light falls on a transparent glass slab of refractive index 1.62. If the reflected ray and the refracted ray are mutually perpendicular, the angle of incidence is

Solution:
QUESTION: 39

In the propagation of light waves, the angle between the direction of vibration and plane of polarisation is

Solution:
QUESTION: 40

Sodium and copper have work functions 2.3 eV and 4.5 eV respectively. Then the ratio of the threshold wavelengths is nearest to

Solution: