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WBJEE Physics Test - 6 - JEE MCQ


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30 Questions MCQ Test - WBJEE Physics Test - 6

WBJEE Physics Test - 6 for JEE 2024 is part of JEE preparation. The WBJEE Physics Test - 6 questions and answers have been prepared according to the JEE exam syllabus.The WBJEE Physics Test - 6 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for WBJEE Physics Test - 6 below.
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WBJEE Physics Test - 6 - Question 1

The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 Ω and 200 V lamp, when not in use?

WBJEE Physics Test - 6 - Question 2

If two atoms have their atomic numbers as z1 and z2 , the ratio of the wavelengths λ1 and λ2 corresponding to their K α lines is

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WBJEE Physics Test - 6 - Question 3

A potential difference of V is applied at the ends of a copper wire of length l and diameter d. On doubling only d, drift velocity

WBJEE Physics Test - 6 - Question 4

A spherical ball contracts in volume by 0.01% when subjected to a normal uniform pressure of 100 atmospheres. The bulk modulus of its material in dyne/cm2 is

WBJEE Physics Test - 6 - Question 5

A 220 V, 50 Hz a.c. source is connected to an inductance of 0.2 H and a resistance of 2 Ω in series. What is current in the circuit ?

WBJEE Physics Test - 6 - Question 6

Minimum no. of 8 μF and 250 V capacitors, used to make a combination of 16 μF and 1000 V, is

WBJEE Physics Test - 6 - Question 7

The value of g on the earth's surface is 980 cm/sec2. Its value at a height of 64 km from the earth's surface is

WBJEE Physics Test - 6 - Question 8

A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 m−s⁻1. The kinetic energy of the other mass is

WBJEE Physics Test - 6 - Question 9

The Torque acting on a current carrying coil placed in a magnetic field is given by

WBJEE Physics Test - 6 - Question 10

A galvanometer of range 10 mA has a coil of resistance 1 Ω. To use it as a voltmeter of range 10 V, the resistance that must be connected in series with it, is

WBJEE Physics Test - 6 - Question 11

The magnetic lines of force inside a bar magnet

WBJEE Physics Test - 6 - Question 12

By which velocity a ball be projected vertically so that the distance covered by it in 5th second is twice the distance it covers in its 6th second (g=10 m/s2)

WBJEE Physics Test - 6 - Question 13

A coin, placed on a rotating turn-table slips, when it is placed at a distance of 9 cm from the centre. If angular velocity of the turn-table is trippled, it will just slip if its distance from the centre is

WBJEE Physics Test - 6 - Question 14

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

Detailed Solution for WBJEE Physics Test - 6 - Question 14

WBJEE Physics Test - 6 - Question 15

Which of the following is an example of motion in three dimensions?

WBJEE Physics Test - 6 - Question 16

The nucleus of 56Ba141 contains ---- neutrons

WBJEE Physics Test - 6 - Question 17

A U-tube contains water and methylated spirit seperated by mercury. The mercury columns in the two arms are in level with 18 cm of water in one arm and 20 cm spirit in the other arm. The density of spirit is (Density of water=1 g-cm-3)

Detailed Solution for WBJEE Physics Test - 6 - Question 17


For water column in one arm of U - tube
h1 = 18 cm, ρ1 = 1 gm cm-3
For spint column in other arm of U - tube
h2 18 cm, ρ2 = ?
If P1 and P2 be the pressures exerted by water column and spirit column respectively
Then P1 = h1 ρ1 g
and P2 = h2 ρ2 g
The mercury columns in the two arms of U-tube are at the same level, thus in equilibrium
P1 = P2
or h1 ρ1 g = h2 ρ2 g

WBJEE Physics Test - 6 - Question 18

The length of second pendulum on the earth where g is 9.8 m/s2 is 1m. The length of a second pendulum on aplanet where = 4.9 m/s2 will be

WBJEE Physics Test - 6 - Question 19

A particle is viberating in a simple harmonic motion with an amplitude of 4 cm. At what displacement from the equilibrium position, is its energy half potential and kinetic ?

WBJEE Physics Test - 6 - Question 20

A glass slab is placed in the path of convergent light. The point of convergence of light

WBJEE Physics Test - 6 - Question 21

A cylindrical solid of mass M has radius R and length L. Its moment of inertia about a generator is

WBJEE Physics Test - 6 - Question 22

A constant torque of 1000 N-m turns a wheel of moment of inertia 200 kg-m2 about an axis through its centre. Angular velocity of the wheel after 3 s will be

WBJEE Physics Test - 6 - Question 23

At room temperature, a p-type semiconductor has

WBJEE Physics Test - 6 - Question 24

When a Van der Waals' gas undergoes free expansion then its temperature

WBJEE Physics Test - 6 - Question 25

Electrical conductivity of a semiconductor

WBJEE Physics Test - 6 - Question 26

A mountain climber finds that water boils at 80ºC. The temperature of this boiling water on Fahrenheit scale is

WBJEE Physics Test - 6 - Question 27

Curie is a unit of

WBJEE Physics Test - 6 - Question 28

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 S1p − S2p   in microns is

WBJEE Physics Test - 6 - Question 29

A particle is projected at an angle of 45º with the horizontal. The kinetic energy of the particle, at the highest point in its flight, is (where K is initial kinetic energy of the particle)

WBJEE Physics Test - 6 - Question 30

If   represent the sides AB and BC of a regular hexagon ABCDEF, then the vector   equals

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