JEE Exam  >  JEE Tests  >  WBJEE Previous Year - 2012 - JEE MCQ

WBJEE Previous Year - 2012 - JEE MCQ


Test Description

30 Questions MCQ Test - WBJEE Previous Year - 2012

WBJEE Previous Year - 2012 for JEE 2024 is part of JEE preparation. The WBJEE Previous Year - 2012 questions and answers have been prepared according to the JEE exam syllabus.The WBJEE Previous Year - 2012 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for WBJEE Previous Year - 2012 below.
Solutions of WBJEE Previous Year - 2012 questions in English are available as part of our course for JEE & WBJEE Previous Year - 2012 solutions in Hindi for JEE course. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free. Attempt WBJEE Previous Year - 2012 | 160 questions in 300 minutes | Mock test for JEE preparation | Free important questions MCQ to study for JEE Exam | Download free PDF with solutions
WBJEE Previous Year - 2012 - Question 1

In a mercury thermometer the ice point (lower fixed point) is marked as 10o and the steam point (upper fixed point) is marked as 130o. At 40oC temperature, what will this thermometer read?

Detailed Solution for WBJEE Previous Year - 2012 - Question 1

WBJEE Previous Year - 2012 - Question 2

The magnetic flux linked with a coil satisfies the relation = 4t2 + 6t + 9 Wb, where t is the time in second. The e.m.f. induced in the coil at t = 2 second is

Detailed Solution for WBJEE Previous Year - 2012 - Question 2

1 Crore+ students have signed up on EduRev. Have you? Download the App
WBJEE Previous Year - 2012 - Question 3

Water is flowing through a very narrow tube. The velocity of water below which the flow remains a streamline flow is known as

WBJEE Previous Year - 2012 - Question 4

If the velocity of light in vacuum is 3 x 108 ms–1, the time taken (in nanosecond) to travel through a glass of thickness 10 cm and refractive index 1.5 is

Detailed Solution for WBJEE Previous Year - 2012 - Question 4

WBJEE Previous Year - 2012 - Question 5

A charge +q is placed at the orgin O of X – Y axes as shown in the figure. The work done in taking a charge Q from A to B along the straight line AB is

Detailed Solution for WBJEE Previous Year - 2012 - Question 5

WBJEE Previous Year - 2012 - Question 6

What current will flow through 2 k resistor in the circuit shown in the figure?

Detailed Solution for WBJEE Previous Year - 2012 - Question 6

I1= current through 2 kΩ

WBJEE Previous Year - 2012 - Question 7

In a region, the intensity of an electric field is given by  in NC–1. The electric flux through a surface  in the region is

Detailed Solution for WBJEE Previous Year - 2012 - Question 7

WBJEE Previous Year - 2012 - Question 8

A train approaching a railway platform with a speed of 20 ms–1 starts blowing the whistle. Speed of sound in air is 340 ms–1. If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound to a person standing on the platform will appear to be

Detailed Solution for WBJEE Previous Year - 2012 - Question 8

WBJEE Previous Year - 2012 - Question 9

A straight wire of length 2 m carries a current of 10 A. If this wire is placed in a uniform magnetic field of 0.15 T making an angle of 45o with the magnetic field, the applied force on the wire will be

Detailed Solution for WBJEE Previous Year - 2012 - Question 9

WBJEE Previous Year - 2012 - Question 10

What is the phase difference between two simple harmonic motions represented by    and x2 = A cos (ωt)?

Detailed Solution for WBJEE Previous Year - 2012 - Question 10

WBJEE Previous Year - 2012 - Question 11

Heat is produced at a rate given by H in a resistor when it is connected across a supply of voltage V. If now the resistance of the resistor is doubled and the supply voltage is made V/3 then the rate of production of heat in the resistor will be

Detailed Solution for WBJEE Previous Year - 2012 - Question 11

WBJEE Previous Year - 2012 - Question 12

Two elements A and B with atomic numbers ZA and ZB are used to produce characteristic x–rays with frequencies A and B respectively. If ZA : ZB= 1 : 2, then vA : vB will be

Detailed Solution for WBJEE Previous Year - 2012 - Question 12

√v = a(z - b) , Ignoring screening effect (i.e. b=0)

WBJEE Previous Year - 2012 - Question 13

The de Broglie wavelength of an electron moving with a velocity c/2 (c = velocity of light in vacuum) is equal to the wavelength of a photon. The ratio of the kinetic energies of electron and photon is

Detailed Solution for WBJEE Previous Year - 2012 - Question 13

WBJEE Previous Year - 2012 - Question 14

Two infinite parallel metal planes, contain electric charges with charge densities + and – respectively and they are separated by a small distance in air. If the permittivity of air is 0 then the magnitude of the field between the two planes with its direction will be

WBJEE Previous Year - 2012 - Question 15

A box of mass 2 kg is placed on the roof of a car. The box would remain stationary until the car attains a maximum acceleration. Coefficient of static friction between the box and the roof of the car is 0.2 and g = 10 ms–2.This maximum acceleration of the car, for the box to remain stationary, is

Detailed Solution for WBJEE Previous Year - 2012 - Question 15

amax = μg =0.2x 10 = 2 m/s2

WBJEE Previous Year - 2012 - Question 16

The dimension of angular momentum is

Detailed Solution for WBJEE Previous Year - 2012 - Question 16

[L]= [m r v] = [M1L2T–1]

WBJEE Previous Year - 2012 - Question 17

 have scalar magnitudes of 5, 4 , 3 units respectivley then the angle between A and C is

Detailed Solution for WBJEE Previous Year - 2012 - Question 17

WBJEE Previous Year - 2012 - Question 18

A particle is travelling along a straight line OX. The distance x (in meters) of the particle from O at a time t is given by x = 37 + 27 t – t3 where t is time in seconds. The distance of the particle from O when it comes to rest is

Detailed Solution for WBJEE Previous Year - 2012 - Question 18

t = 3 sec. x = 37 + 27 x 3 – 33, = 37 + 81 – 27 = 91 m

WBJEE Previous Year - 2012 - Question 19

A particle is projected from the ground with kinetic energy E at an angle of 600 with the horizontal. Its kinetic energy at the highest point of its motion will be

Detailed Solution for WBJEE Previous Year - 2012 - Question 19

WBJEE Previous Year - 2012 - Question 20

A bullet on penetrating 30 cm into its target loses its velocity by 50%. What additional distance will it penetrate into the target before it comes to rest?

Detailed Solution for WBJEE Previous Year - 2012 - Question 20

 From (1) and (2) s = 10 m

WBJEE Previous Year - 2012 - Question 21

When a spring is stretched by 10 cm, the potential energy stored is E. When the spring is stretched by 10 cm more, the potential energy stored in the spring becomes

Detailed Solution for WBJEE Previous Year - 2012 - Question 21

WBJEE Previous Year - 2012 - Question 22

Average distance of the earth from the Sun is L1. If one year of the Earth = D days, one year of another planet whose average distance from the Sun is L2 will be

Detailed Solution for WBJEE Previous Year - 2012 - Question 22

WBJEE Previous Year - 2012 - Question 23

A spherical ball A of mass 4 kg, moving along a straight line strikes another spherical ball B of mass 1 kg at rest.
After the collision, A and B move with velocities v1 ms–1 and v2 ms–1 respectively making angles of 30o and 60o with respect to the original direction of motion of A. The ratio v1/v2 will be

Detailed Solution for WBJEE Previous Year - 2012 - Question 23

Apply conservation of momentum along Normal

WBJEE Previous Year - 2012 - Question 24

The decimal number equivalent ot a binary number 1011001 is

Detailed Solution for WBJEE Previous Year - 2012 - Question 24

(1011001)2= 1 x 26 + 0 x 25 +1x 24 + 1x 23 + 0x 22 + 0x 21 + 1x 20  = 64 + 16 + 8 + 1 =89

WBJEE Previous Year - 2012 - Question 25

The frequency of the first overtone of a closed pipe of length l1 is equal to that of the first overtone of an open pipe of length l2. The ratio of their lenghts (l1 : l2) is

Detailed Solution for WBJEE Previous Year - 2012 - Question 25

WBJEE Previous Year - 2012 - Question 26

The I – V characteristics of a metal wire at two different temperatures (T1 and T2) are given in the adjoining figure. Here, we can conclude that

Detailed Solution for WBJEE Previous Year - 2012 - Question 26

1/V = 1/R

slope of curve, R ∞T greater the slope smaller will be temperature.    

T1 < T2

WBJEE Previous Year - 2012 - Question 27

In a slide calipers, (m + 1) number of vernier divisions is equal to m number of smallest main scale divisions. If d unit is the magnitude of the smallest main scale division, then the magnitude of the vernier constant is

Detailed Solution for WBJEE Previous Year - 2012 - Question 27

WBJEE Previous Year - 2012 - Question 28

From the top of a tower, 80 m high from the ground, a stone is thrown in the horizontal direction with a velocity of 8 ms–1. The stone reaches the ground after a time ‘t’ and falls at a distance of ‘d’ from the foot of the tower. Assuming g = 10 ms–2, the time t and distance d are given respectively by

Detailed Solution for WBJEE Previous Year - 2012 - Question 28

time of flight (t) = 

WBJEE Previous Year - 2012 - Question 29

A Wheatstone bridge has the resistances 10 Ω , 10 Ω , 10Ω and 30 Ω in its four arms. What resistance joined in parallel to the 30 resistance will bring it to the balanced condition?

Detailed Solution for WBJEE Previous Year - 2012 - Question 29

 for a balanced bridge. R = 10 Ω

WBJEE Previous Year - 2012 - Question 30

An electric bulb marked as 50 W–200 V is connected across a 100 V supply. The present power of the bulb is

Detailed Solution for WBJEE Previous Year - 2012 - Question 30

View more questions
Information about WBJEE Previous Year - 2012 Page
In this test you can find the Exam questions for WBJEE Previous Year - 2012 solved & explained in the simplest way possible. Besides giving Questions and answers for WBJEE Previous Year - 2012, EduRev gives you an ample number of Online tests for practice

Top Courses for JEE

Download as PDF

Top Courses for JEE