WBJEE Previous Year (2010) - JEE MCQ

# WBJEE Previous Year (2010) - JEE MCQ

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## 70 Questions MCQ Test WBJEE Sample Papers, Section Wise & Full Mock Tests 2024 - WBJEE Previous Year (2010)

WBJEE Previous Year (2010) for JEE 2024 is part of WBJEE Sample Papers, Section Wise & Full Mock Tests 2024 preparation. The WBJEE Previous Year (2010) questions and answers have been prepared according to the JEE exam syllabus.The WBJEE Previous Year (2010) MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for WBJEE Previous Year (2010) below.
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WBJEE Previous Year (2010) - Question 1

### Experimental investigations show that the intensity of solar radiation is maximum for a wavelength 480 nm in the visible region. Estimate the surface temperature of sun. Given Wein’s constant b = 2.88 × 10–3 mK.

Detailed Solution for WBJEE Previous Year (2010) - Question 1

λm × T = b
λm = 480 nm

WBJEE Previous Year (2010) - Question 2

### The temperature of an ideal gas is increased from 120 K to 480 K. If at 120 K, the root mean square speed of gas molecules is v, then at 480 K it will be

Detailed Solution for WBJEE Previous Year (2010) - Question 2

WBJEE Previous Year (2010) - Question 3

### Two mirrors at an angle θº produce 5 images of a point. The number of images produced when θ is decreased to θº – 30º is

Detailed Solution for WBJEE Previous Year (2010) - Question 3

No. of images = 5
∴ θ = 60º
New angle = θ – 30º = 30º. No of images

WBJEE Previous Year (2010) - Question 4

he radius of the light circle observed by a fish at a depth of 12 meter is (refractive index of water = 4/3)

Detailed Solution for WBJEE Previous Year (2010) - Question 4

WBJEE Previous Year (2010) - Question 5

In Young’s double slit experiment, the fringe width is β. If the entire arrangement is placed in a liquid of refractive index n, the fringe width becomes :

WBJEE Previous Year (2010) - Question 6

A plano-convex lens (f = 20 cm) is silvered at plane surface. Now focal length will be :

Detailed Solution for WBJEE Previous Year (2010) - Question 6

P = 2PL + PM
PM = 0

WBJEE Previous Year (2010) - Question 7

The light beams of intensities in the ratio of 9 : 1 are allowed to interfere. What will be the ratio of the intensities of maxima and minima ?

Detailed Solution for WBJEE Previous Year (2010) - Question 7

WBJEE Previous Year (2010) - Question 8

If x1 be the size of the magnified image and x2 the size of the diminished image in Lens Displacement Method, then the size of the object is :

WBJEE Previous Year (2010) - Question 9

A point charge +q is placed at the centre of a cube of side L. The electric flux emerging from the cube is

Detailed Solution for WBJEE Previous Year (2010) - Question 9
Concept: Gauss Law. By Gauss theorem ... Total electric flux = Total charge inside cube /€. Flux = q/€. (where € is permittivity). Hence answer is 'A'.
WBJEE Previous Year (2010) - Question 10

Two capacitors of equal capacity are first connected in parallel and then in series. The ratio of the total capacities in the two cases will be

WBJEE Previous Year (2010) - Question 11

n identical droplets are charged to v volt each. If they coalesce to form a single drop, then its potential will be

Detailed Solution for WBJEE Previous Year (2010) - Question 11

WBJEE Previous Year (2010) - Question 12

The reading of the ammeter in the following figure will be

Detailed Solution for WBJEE Previous Year (2010) - Question 12

WBJEE Previous Year (2010) - Question 13

A wire of resistance R is elongated n-fold to make a new uniform wire. The resistance of new wire

Detailed Solution for WBJEE Previous Year (2010) - Question 13

R' = n2R

WBJEE Previous Year (2010) - Question 14

The ratio of magnetic field and magnetic moment at the centre of a current carrying circular loop is x. When both the current and radius is doubled the ratio will be

Detailed Solution for WBJEE Previous Year (2010) - Question 14

WBJEE Previous Year (2010) - Question 15

The current through a coil of self inductance L = 2mH is given by I = t2 e–t at time t. How long it will take to make the e.m.f. zero?

Detailed Solution for WBJEE Previous Year (2010) - Question 15

I = t2 e–t

WBJEE Previous Year (2010) - Question 16

The magnetic flux through a loop of resistance 10 Ω is given by φ = 5t2 – 4t + 1 Weber. How much current is induced in the loop after 0.2 sec ?

Detailed Solution for WBJEE Previous Year (2010) - Question 16

WBJEE Previous Year (2010) - Question 17

The decimal equivalent of the binary number (11010.101)2 is

Detailed Solution for WBJEE Previous Year (2010) - Question 17

(11010.101) = 0 × 2º + 1 × 21 + 0 × 22 + 1 × 23 + 1 × 24 + 1 × 2–1 + 0 × 2–2 + 1 × 2–3 = 2 + 8 + 16

WBJEE Previous Year (2010) - Question 18

In a common emitter configuration, a transistor has β = 50 and input resistance 1 kΩ. If the peak value of a.c. input is 0.01 V then the peak value of collector current is

Detailed Solution for WBJEE Previous Year (2010) - Question 18

WBJEE Previous Year (2010) - Question 19

Half-life of a radioactive substance is 20 minute. The time between 20% and 80% decay will be :

Detailed Solution for WBJEE Previous Year (2010) - Question 19

For 20% decay

For 80% decay

On dividing

WBJEE Previous Year (2010) - Question 20

The energy released by the fission of one uranium atom is 200 MeV. The number of fissions per second required to produce 3.2 W of power is (Take 1 eV = 1.6 × 10–19 J)

Detailed Solution for WBJEE Previous Year (2010) - Question 20

u = 200 MeV = 200 × 106 eV = 200 × 106 × 1.6 × 10–19 J
E = 3.2 J
No of fissions

WBJEE Previous Year (2010) - Question 21

A body is projected with a speed u m/s at an angle β with the horizontal. The kinetic energy at the highest point is 3/4th of the initial kinetic energy. The value of β is :

Detailed Solution for WBJEE Previous Year (2010) - Question 21

K.E. = K cos2 β

WBJEE Previous Year (2010) - Question 22

A ball is projected horizontally with a velocity of 5 m/s from the top of a building 19.6 m high. How long will the ball take of hit the ground ?

Detailed Solution for WBJEE Previous Year (2010) - Question 22

WBJEE Previous Year (2010) - Question 23

A stone falls freely from rest and the total distance covered by it in the last second of its motion equals the distance covered by it in the first three seconds of its motion. The stone remains in the air for

Detailed Solution for WBJEE Previous Year (2010) - Question 23

u = 0

WBJEE Previous Year (2010) - Question 24

Two blocks of 2 kg and 1 kg are in contact on a frictionless table. If a force of 3 N is applied on 2 kg block, then the force ofcontact between the two blocks will be :

Detailed Solution for WBJEE Previous Year (2010) - Question 24

WBJEE Previous Year (2010) - Question 25

If momentum is increased by 20%, then kinetic energy increases by

Detailed Solution for WBJEE Previous Year (2010) - Question 25

WBJEE Previous Year (2010) - Question 26

A boy of mass 40 kg is climbing a vertical pole at a constant speed. If the coefficient of friction between his palms and the poleis 0.8 and g = 10 m/s2, the horizontal force that he is applying on the pole is

Detailed Solution for WBJEE Previous Year (2010) - Question 26

WBJEE Previous Year (2010) - Question 27

The value of ‘λ’ for which the two vectors a =5iˆ+λ jˆ+kˆ  and b =iˆ−2jˆ+kˆare perpendicular to each other is

Detailed Solution for WBJEE Previous Year (2010) - Question 27

WBJEE Previous Year (2010) - Question 28

If , then the angle included between and is

Detailed Solution for WBJEE Previous Year (2010) - Question 28

WBJEE Previous Year (2010) - Question 29

The height vertically above the earth’s surface at which the acceleration due to gravity becomes 1% of its value at the surface is (R is the radius of the Earth)​

Detailed Solution for WBJEE Previous Year (2010) - Question 29

WBJEE Previous Year (2010) - Question 30

The change in the gravitational potential energy when a body of mass m is raised to a height nR above the surface of the Earth is (here R is the radius of the Earth)

Detailed Solution for WBJEE Previous Year (2010) - Question 30

WBJEE Previous Year (2010) - Question 31

A particle of mass m is attached to three identical massless springs of spring constant ‘k’ as shown in the figure. The time period of vertical oscillation of the particle is

Detailed Solution for WBJEE Previous Year (2010) - Question 31

WBJEE Previous Year (2010) - Question 32

A spring of force constant k is cut into three equal parts. The force constant of each part would be

Detailed Solution for WBJEE Previous Year (2010) - Question 32

WBJEE Previous Year (2010) - Question 33

A body floats in water with 40% of its volume outside water. When the same body floats in oil, 60% of its volume remains outside oil. The relative density of the oil is ​

Detailed Solution for WBJEE Previous Year (2010) - Question 33

WBJEE Previous Year (2010) - Question 34

A uniform long tube is bent into a circle of radius R and it lies in vertical plane. Two liquids of same volume but densities ρ and δ fill  half the tube. The angle θ is

Detailed Solution for WBJEE Previous Year (2010) - Question 34

WBJEE Previous Year (2010) - Question 35

Two solid spheres of same metal but of mass M and 8 M fall simultaneously on a viscous liquid and their terminal velocities are v and nv then value of n is ​

Detailed Solution for WBJEE Previous Year (2010) - Question 35

WBJEE Previous Year (2010) - Question 36

A particle is executing linear simple harmonic motion of amplitude A. At what displacement is the energy of the particle half potential and half kinetic ?

Detailed Solution for WBJEE Previous Year (2010) - Question 36

WBJEE Previous Year (2010) - Question 37

The equation of a progressive wave is y = 4 sin (4πt – 0.04 x  + π/3) where x is in meter and t is in second. The velocity of the wave is

Detailed Solution for WBJEE Previous Year (2010) - Question 37

WBJEE Previous Year (2010) - Question 38

A longitudinal wave is represented by x = x0 sin 2π(nt – x/λ). The maximum particle velocity will be four times the wave velocity if :

Detailed Solution for WBJEE Previous Year (2010) - Question 38

WBJEE Previous Year (2010) - Question 39

A block of ice at temperature –20 ºC is slowly heated and converted to steam at 100 ºC. Which of the following diagram is most appropriate ?

Detailed Solution for WBJEE Previous Year (2010) - Question 39

WBJEE Previous Year (2010) - Question 40

Two black bodies at temperatures 327 ºC and 427 ºC are kept in an evacuated chamber at 27 ºC. The ratio of their rates of loss of heat are :

Detailed Solution for WBJEE Previous Year (2010) - Question 40

WBJEE Previous Year (2010) - Question 41

At identical temperature and pressure, the rate of diffusion of hydrogen gas is 33 times that of a hydrocarbon having molecular formula CnH2n–2 . What is the value of ‘n’ ?​

Detailed Solution for WBJEE Previous Year (2010) - Question 41

WBJEE Previous Year (2010) - Question 42

Dipole moment of  is 1.5D. The dipole moment of  is​

Detailed Solution for WBJEE Previous Year (2010) - Question 42

WBJEE Previous Year (2010) - Question 43

Which of the following thermodynamic relation is correct ? ​

Detailed Solution for WBJEE Previous Year (2010) - Question 43

WBJEE Previous Year (2010) - Question 44

In the hydrolysis of an organic chloride in presence of large excess of water; RCI + H2O → ROH + HCl​

Detailed Solution for WBJEE Previous Year (2010) - Question 44

WBJEE Previous Year (2010) - Question 45

The potential of a hydrogen electrode at pH = 10 is​

Detailed Solution for WBJEE Previous Year (2010) - Question 45

WBJEE Previous Year (2010) - Question 46

Calculate KC for the reversible process given below if KP = 167 and T = 8000C 32CaCO (s)  CaO(s) + CO (g)​

Detailed Solution for WBJEE Previous Year (2010) - Question 46

WBJEE Previous Year (2010) - Question 47

For a reversible chemical reaction where the forward process is exothermic, which of the following statements is correct ?​

Detailed Solution for WBJEE Previous Year (2010) - Question 47

WBJEE Previous Year (2010) - Question 48

In Sommerfeld’s modification of Bohr’s theory, the trajectory of an electron in a hydrogen atom is​

WBJEE Previous Year (2010) - Question 49

In the reaction of sodium thiosulphate with I2 in aqueous medium the equivalent weight of sodium thiosulphate is equal to ​

Detailed Solution for WBJEE Previous Year (2010) - Question 49

WBJEE Previous Year (2010) - Question 50

0.1 (M) HCI and 0.1 (M) H2SO4 each of volume 2ml are mixed and the volume is made up to 6 ml by adding 2ml of 0.01 (N) NaCl solution. The pH of the resulting mixture is ​

Detailed Solution for WBJEE Previous Year (2010) - Question 50

WBJEE Previous Year (2010) - Question 51

The molarity of a NaOH solution by dissolving 4 g of it in 250 ml water is ​

Detailed Solution for WBJEE Previous Year (2010) - Question 51

WBJEE Previous Year (2010) - Question 52

If a species has 16 protons, 18 electrons and 16 neutrons, find the species and its charge​

Detailed Solution for WBJEE Previous Year (2010) - Question 52

WBJEE Previous Year (2010) - Question 53

In a periodic table the basic character of oxides​

WBJEE Previous Year (2010) - Question 54

Which one of the following contains P – O – P bond ?​

Detailed Solution for WBJEE Previous Year (2010) - Question 54

WBJEE Previous Year (2010) - Question 55

Which of the following orders regarding ionization energy is correct ? ​

Detailed Solution for WBJEE Previous Year (2010) - Question 55

WBJEE Previous Year (2010) - Question 56

Which of the following statements regarding ozone is not correct ?​

Detailed Solution for WBJEE Previous Year (2010) - Question 56

WBJEE Previous Year (2010) - Question 57

P4O10 is the anhydride of​

WBJEE Previous Year (2010) - Question 58

Which of the following metals has the largest abundance in the earth’s crust ?​

Detailed Solution for WBJEE Previous Year (2010) - Question 58

The most abundant metal in the Earth's crust is aluminium. Although it is the most abundant metal, it is never found free in nature due to its reactivity. All of the earth's aluminium has combined with other elements to form compounds.

WBJEE Previous Year (2010) - Question 59

Which of the following orbitals will have zero probability of finding the electron in the yz plane ? ​

WBJEE Previous Year (2010) - Question 60

What type of orbital hybridisation is considered on P in PCl5 ? ​

WBJEE Previous Year (2010) - Question 61

For which element the inertness of the electron pair will not be observed?​

WBJEE Previous Year (2010) - Question 62

In which of the following molecules is hydrogen bridge bond present? ​

WBJEE Previous Year (2010) - Question 63

When a manganous salt is fused with a mixture of KNO3 and solid NaOH the oxidation number of Mn changes from +2 to​

Detailed Solution for WBJEE Previous Year (2010) - Question 63

WBJEE Previous Year (2010) - Question 64

In hemoglobin the metal ion present is​

WBJEE Previous Year (2010) - Question 65

Ortho-and para-hydrogens have​

WBJEE Previous Year (2010) - Question 66

The bond order of CO molecule is ​

WBJEE Previous Year (2010) - Question 67

Vitamin  C is​

WBJEE Previous Year (2010) - Question 68

On mixing an alkane with chlorine and irradiating with ultra-violet light, it forms only one mono-chloro-alkane. The alkane is​

WBJEE Previous Year (2010) - Question 69

Keto-enol tautomerism is not observed in​

WBJEE Previous Year (2010) - Question 70

What is obtained when nitrobenzene is treated sequentially with (i) NH4Cl/Zn dust and (ii) H2SO4/Na2Cr2O7  ?

Detailed Solution for WBJEE Previous Year (2010) - Question 70

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