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# WBJEE Physics Test - 12

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WBJEE Physics Test - 12 for JEE 2023 is part of WBJEE Sample Papers, Section Wise & Full Mock Tests preparation. The WBJEE Physics Test - 12 questions and answers have been prepared according to the JEE exam syllabus.The WBJEE Physics Test - 12 MCQs are made for JEE 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for WBJEE Physics Test - 12 below.
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WBJEE Physics Test - 12 - Question 1

### A metallic wire of 40 Ω resistance is drawn to double its length. Its new resistance will be

Detailed Solution for WBJEE Physics Test - 12 - Question 1 Resistance is a material property which is directly proportional to its length and inversely to its area. Here if the wire is drawn to double its length, then AREA WILL ALSO DECREASE TO ITS HALF. Therefore, the resistance is increased to 4 times the initial value. 4×40=160 Ω
WBJEE Physics Test - 12 - Question 2

### A wire of resistance 10 Ω is elongated by 10%, the resistance of the elongated wire is

WBJEE Physics Test - 12 - Question 3

### If for material Young's modulus is 6.6 x 1010 N ∕ m2 and bulk modulus is 11 x 1010  N ∕ m2 then the Poisson's ratio is...

WBJEE Physics Test - 12 - Question 4

For high frequency, capacitor offers

WBJEE Physics Test - 12 - Question 5

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

WBJEE Physics Test - 12 - Question 6

Suppose an electron is attracted towards the origin by a force k/r where 'k' is a constant and 'r' is the distance of the electron from the origin . By applying Bohr model to this system , the radius of the nth orbital of the electron is found to be 'r'n and the kinetic energy of the electron to be Tn . Then which of the following is true ?

WBJEE Physics Test - 12 - Question 7

A cylinder of radius r and length a is placed in a uniform in a uniform electric field E parallel to the axis of the cylinder. The total electric flux over the curved surface of cylinder is

Detailed Solution for WBJEE Physics Test - 12 - Question 7

The electric flux entering and leaving the cylindrical surface is same
Φ = EπR2 - EπR2 = 0
where, E = electric field
Φ = outward flux

WBJEE Physics Test - 12 - Question 8

If the radius of the earth were to shrink by 1% its mass remaining same, the acceleration due to gravity on the earth's surface would

WBJEE Physics Test - 12 - Question 9

A rocket with a lift-off mass 3.5 x 104  kg is blasted upwards with an initial acceleration of 10m/s2. Then the initial thrust of the blast is

WBJEE Physics Test - 12 - Question 10

Which of the following relations represent Biot-Savart's law?

WBJEE Physics Test - 12 - Question 11

A moving coil galvanometer of resistance 100 Ω shows full scale deflection when a current of 100 micro-amperes passes through it. If it is intended to show full scale deflection when a current of 1 milli-ampere passes through it, the value of shunt resistance in ohms to be connected to the galvanometer is

WBJEE Physics Test - 12 - Question 12

When 2 A current is passed through the coil of a tangent galvanometer, it gives a deflection of 45o. For 60deflection, the current must be

WBJEE Physics Test - 12 - Question 13

A beaker containing a liquid of density (ρ) moves up with an acceleration (a). The pressure due to liquid at a depth (h) below the surface of the liquid is

WBJEE Physics Test - 12 - Question 14

A car travelling on a straight track moves with uniform velocity of ν₁ for some time and uniform velocity ν₂ for the next equal time. The average velocity of the car is

WBJEE Physics Test - 12 - Question 15

An object is projected with a velocity of 20 m/s making an angle of 45o with horizontal. The equation for the trajectory is h = Ax - Bx2 where h is height, x is horizontal distance, A and B are constants. The ratio A : B is (g = 10 ms-2)

WBJEE Physics Test - 12 - Question 16

A 1 kg stone at the end of 1 m long string is whirled in a vertical circle at constant speed of 4 m/sec. The tension in the string is 6 N,when the stone is at (g = 10m/sec2)

WBJEE Physics Test - 12 - Question 17

Consider α -particles, β -particles and γ -rays, each having an energy of 0.5 MeV. In increasing order of penetrating powers, the radiations are

WBJEE Physics Test - 12 - Question 18

If the displacement of a particle executing S.H.M. is given by y= 0.30 sin (220t+0.64) in metre, then the frequency and maximum velocity of the particle is

WBJEE Physics Test - 12 - Question 19

Two springs of constants k₁ and k₂, have equal highest velocities, when executing SHM. Then, the ratio of their amplitudes (given their masses are eqaul) will be

WBJEE Physics Test - 12 - Question 20

'Mirage' is a phenomenon due to

WBJEE Physics Test - 12 - Question 21

The moment of inertia of a disc of mass M and radius R about an axis, which is tangential to circumference of disc and parallel to its diameter is

WBJEE Physics Test - 12 - Question 22

A disc is rotating with an angular velocity of ω. If a child sits on it, which of the following is conserved?

WBJEE Physics Test - 12 - Question 23

In p-n junction, avalanche current flows in circuit when biasing is

WBJEE Physics Test - 12 - Question 24

The state of the energy gained by valance electrons when the temperature is raised or when electric field is applied is called as

WBJEE Physics Test - 12 - Question 25

19g of water at 30 oC and 5g of ice at − 20 oC are mixed together in a calorimeter. What is the final temperature of the mixture ? Given specific heat of ice = 0.5 cal g-1 oC-1  and latent heat of fusion of ice = 0.8 cal g-1 oC-1

WBJEE Physics Test - 12 - Question 26

A gas is being compressed adiabatically. The specific heat of the gas during compression is

WBJEE Physics Test - 12 - Question 27

Hertz is the unit of

WBJEE Physics Test - 12 - Question 28

If p=7i-2j+3k and q=3i+j+5k, then the modulus of p-2q is

WBJEE Physics Test - 12 - Question 29

A wavefront is an imaginary surface where

WBJEE Physics Test - 12 - Question 30

The work done in holding 15 Kg suitcase while waiting for a bus for 15 minutes is

WBJEE Physics Test - 12 - Question 31

Three block of masses m₁,m₂ and m₃ are connected by massless strings as shown on a frictionless table .They are pulled with a force T₃ = 40 N .If m₁ = 10 kg ,m₂ = 6 kg and m₃ = 4 kg, the tension T₂ will be WBJEE Physics Test - 12 - Question 32

Which one of the following has not been expressed in proper units?

WBJEE Physics Test - 12 - Question 33

Two large metal sheets having surface charge densities σ and − σ are held parallel to each other at a small separation. The electric field at any point in the region between the sheets is

WBJEE Physics Test - 12 - Question 34

A standing wave on a string is given by y = (4 cm) cos [ π x] sin [50 π t], where x is in metre and t is in seconds. The velocity of the string section at x = 1/3 m at t = 1/5 s, is

WBJEE Physics Test - 12 - Question 35

A uniform smooth rod placed on a smooth horizontal floor is hit by a particle moving on the floor, at a distance l/4 from one end. Then, the distance travelled by the centre of the rod after the collision when it has completed three revolutions will be [ e ≠ 0, l is the length of the rod]

WBJEE Physics Test - 12 - Question 36

A coin is placed on a horizontal platform which undergoes horizontal S.H.M. about a mean position O. The coin does not slip on the platform. The force of friction acting on the coin is F.

WBJEE Physics Test - 12 - Question 37

H+, He+ and O++ all having the same kinetic energy pass through a region in which there is a uniform magnetic field perpendicular to their velocities. The masses of H+, He+ and O++ are 1 amu, 4 and 16 amu respectively. The

WBJEE Physics Test - 12 - Question 38

Hydrogen gas and oxygen gas have volume 1 cm3 each at N.T.P.

WBJEE Physics Test - 12 - Question 39

A ray incident on a droplet of water comes out of droplet after two refractions and one reflection. If the deviation suffered by the ray is to be minimum, the condition is

WBJEE Physics Test - 12 - Question 40

X-rays are produced in an X-ray tube operating at a given accelerating voltage. The wavelength of the continuous X-rays has values from

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