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150 Questions MCQ Test BITSAT Mock Tests Series & Past Year Papers 2024 - Test: BITSAT Mock Test- 3

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Test: BITSAT Mock Test- 3 - Question 1

An electric motor operates at 20 r.p.s. What will be the approximate power delivered by the motor, if it supplies a torque of 75 N-m?

Test: BITSAT Mock Test- 3 - Question 2

Which of th following transitions in a hydrogen atom emits the photon of highest frequency?

Test: BITSAT Mock Test- 3 - Question 3

The ratio of the longest to shortest wavelengths in Brackett series of hydrogen spectra is

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 3

 

Test: BITSAT Mock Test- 3 - Question 4

Potential difference across the terminals of a battery is 50 V, when 11 A current is drawn. And it is 60 V, when 1 A current is drawn. The e.m.f. and internal resistance of battery is

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 4

e = v + Ir
e = emf
V = potential difference
r = internal resistance
Here e = 50 + 11r .....(1)
and e = 60 + 1r .....(2)
Solving these equations (1) and (2) for e and r we get
e = 61V and r = 1 Ω

Test: BITSAT Mock Test- 3 - Question 5

The unit of specific conductivity is

Test: BITSAT Mock Test- 3 - Question 6

When an inert gas is filled in the place vacuum in a photo cell, then

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 6
In the presence of inert gas photoelectrons emitted by cathode ionise the gas by collision and hence the current increases.
Test: BITSAT Mock Test- 3 - Question 7

Light of frequency 4v₀ is incident on the metal of the threshold frequency v₀. The maximum kinetic energy of the emitted photoelectrons is

Test: BITSAT Mock Test- 3 - Question 8

An L.C. circuit contains 10 mH inductor and a 25 μ F capacitor. The resistance of the circuit is negligible. The energy stored in the circuit is completely magnetic at time (in milli seconds) being measured from the instant when the circuit is closed

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 8

 

Test: BITSAT Mock Test- 3 - Question 9

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

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 9

To get 1000 volts from 250 volts, we have to connect Four capacitors in series. 

For such a series connection, effective capacitance is  2 micro farad, because 1/Ceffective = 1/C1 + 1/C2 +1/C3 +1/C4 = 1/8 + 1/8 + 1/8 + 1/8 = 1/2.
 Therefore Ceffective  = 2 microfarad. Hence the series combination is equivalent of 2 microfarads, 1000 Volts.

Now we have to connect 8 of these four capacitor units in parallel to get 16 micro farads capacitor because in parallel combination, effective capacitance is equal to summation of each capacitor.  Hence capacitors required will be:

4 numbers for each series combinations * 8 such combinations = 32 capacitors. 

Test: BITSAT Mock Test- 3 - Question 10

The ratio of charge to potential of a capacitor is known as its

Test: BITSAT Mock Test- 3 - Question 11

To aviod slipping while walking on ice, one should take smaller steps because of the

Test: BITSAT Mock Test- 3 - Question 12

The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on planet B. A man jumps to a height of 2 m on the surface of A. What will be the height of jump by the same person on the planet B?

Test: BITSAT Mock Test- 3 - Question 13

When a body is heated, which colour corresponds to highest temperature

Test: BITSAT Mock Test- 3 - Question 14

A vessel contains a mixture of one mole of oxygen and two moles of nitrogen at 300 K. The ratio of the average rotational kinetic energy per O₂ molecule to that per N₂ molecule is

Test: BITSAT Mock Test- 3 - Question 15

When a charged particle moves perpendicular to a magnetic field, then

Test: BITSAT Mock Test- 3 - Question 16

The force between two short bar magnets with magnetic moments M₁ and M₂ whose centres are r meter apart is 8 N, when their axes are in same line. If the separation is increased to 2 r, the force between them is reduced to

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 16

Correct Answer :- d

Explanation : In magnetic dipole, force ∝ 1/r4

Hence, new force = 8/24

= 8/16

= 0.5N

Test: BITSAT Mock Test- 3 - Question 17

Oil spreads over the surface of water, whereas water does not spread over the surface of oil, because

Test: BITSAT Mock Test- 3 - Question 18

A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If entire arrangement is put in a freely elevator, the length of water column in the capillary tube will be

Test: BITSAT Mock Test- 3 - Question 19

The breaking stress of a wire depends upon

Test: BITSAT Mock Test- 3 - Question 20

A particle covers 150 m in 8th second when starts from rest, its acceleration is

Test: BITSAT Mock Test- 3 - Question 21

The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is

Test: BITSAT Mock Test- 3 - Question 22

Two vectors A̅ and B̅ are such that A̅ + B̅ = A̅ - B̅. Then

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 22

Correct Answer :- d

Explanation : A + B = A - B

cancelling A both sides, we get

B = - B

Taking -B to other side, we get

2B = 0

B = 0

Test: BITSAT Mock Test- 3 - Question 23

A car of mass 12kg at rest explodes into two pieces of masses 4kg and 8kg which move in opposite direction. If the velocity of 8kg piece is 6 m/s, the kinetic energy of other piece is

Test: BITSAT Mock Test- 3 - Question 24

The image formed by an objective lens of a compound microscope is

Test: BITSAT Mock Test- 3 - Question 25

A chimpanzee, swinging on a swing in a sitting position, stands up suddenly. The time period will

Test: BITSAT Mock Test- 3 - Question 26

An instantaneous displacement of a simple harmonic oscillator is x = A cos (ωt + π/4 ). Its speed will be maximum at time

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 26

The velocity is the time derivative of displacement: v = dy/dt = -Aω (sinωt + π/4 ).
Its maximum magnitude equal to Aω is obtained when ωt = π/4 , from which t = π/4ω

Test: BITSAT Mock Test- 3 - Question 27

A ray of light is incident on a plane mirror at an angle of 60o . The angle of deviation produced by the mirror is

Test: BITSAT Mock Test- 3 - Question 28

Two spheres of masses 2M and M are initially at rest at a distance R apart. Due to mutual force of attraction, they approach each other. When they are at separation R/2, the acceleration of the centre of mass of spheres would be

Test: BITSAT Mock Test- 3 - Question 29

A soild sphere, disc and solid cylinder all of the same mass and made of the same material are allowed to roll down (from rest) on an inclined plane, then

Test: BITSAT Mock Test- 3 - Question 30

A small steel sphere is tied to a string and is whirled in a horizontal circle with a uniform angular velocity ω₁. The string is suddenly pulled so that radius of the circle is halved. If ω₂ is new angular velocity. then

Test: BITSAT Mock Test- 3 - Question 31

If three bulbs 60W, 100W and 200W are connected in parallel, then

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 31

Bulb of higher voltage will glow more

Test: BITSAT Mock Test- 3 - Question 32

A gas performs no work, when it expands

Test: BITSAT Mock Test- 3 - Question 33

A Carnot's engine has an efficiency of 50% at sink temperature 50o C . Calculate the temperature of source.

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 33

Test: BITSAT Mock Test- 3 - Question 34

The dimensions of power are

Test: BITSAT Mock Test- 3 - Question 35

Wave optics is based on wave theory of light put forward by Huygen and modified later by

Test: BITSAT Mock Test- 3 - Question 36

When two coherent monochromatic light beams of intensities I and 4I are superimposed, the ratio between maximum and minimum intensities in the resultant beam is

Test: BITSAT Mock Test- 3 - Question 37

In the stationary waves the phase difference between two particles of the medium situated on the opposite sides of a node is

Test: BITSAT Mock Test- 3 - Question 38

The equation of progressive wave is y = a sin(200t - x). whre x is in meter and t is in second. The velcoity of wave is

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 38

Comparing the given equation with y = a sin (wt - kx) (w = 200, k = 1)
So, v = w/k = 200 m/s

Test: BITSAT Mock Test- 3 - Question 39

A force of 170 N is applied to a body of mass 5 kg which raised it vertically to a height of 10 m. The velocity of the body at this height will be

Test: BITSAT Mock Test- 3 - Question 40

Two equal masses are attached to the ends of a spring of spring constant k. The two masses are pulled out equally to stretch the spring by 'x'. The work done by the spring on each mass is

Test: BITSAT Mock Test- 3 - Question 41

Reaction of phenol with chloroform and sodium hydroxide to give o-hydroxybenzaldehyde involves the formation of

Test: BITSAT Mock Test- 3 - Question 42

Which of the following reagent react differently with HCHO and CH₃CHO and CH₃COCH₃

Test: BITSAT Mock Test- 3 - Question 43

The orientation of an atomic orbital is governed by

Test: BITSAT Mock Test- 3 - Question 44

For principle quantum number n = 4, the total number of orbitals having l = 3 is

Test: BITSAT Mock Test- 3 - Question 45

The random errors can be eliminated by

Test: BITSAT Mock Test- 3 - Question 46

1.5 mol of O₂ combine with Mg to form oxide MgO. The mass of Mg (at. mass 24) that has combined is

Test: BITSAT Mock Test- 3 - Question 47

Which of the following is the strongest nucleophile?

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 47

A negatively charged nucleophile is always stronger than a neutral one

Test: BITSAT Mock Test- 3 - Question 48

Which of the following does not show electromeric effect?

Test: BITSAT Mock Test- 3 - Question 49

Which carbohydrate is an essential constituent of plant cells?

Test: BITSAT Mock Test- 3 - Question 50

Cane sugar on hydrolysis gives

Test: BITSAT Mock Test- 3 - Question 51

Dimerisation in carboxylic acid is due to

Test: BITSAT Mock Test- 3 - Question 52

The maximum number of hydrogen bonds formed by a water molecule in ice, is

Test: BITSAT Mock Test- 3 - Question 53

A well stoppered thermos flask contains some ice cubes . This is an example of

Test: BITSAT Mock Test- 3 - Question 54

Just before attaining equilibrium by a reversible reaction, it is found that

Test: BITSAT Mock Test- 3 - Question 55

The rate constant is given by the equation K = P Ze(-E/RT). Which factor should register a decrease for the reaction to proceed more rapidly?

Test: BITSAT Mock Test- 3 - Question 56

Which one of the following relations is correct with respect to first (I) and second (II) ionization potential of Sodium and Magnesium ?

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 56

As we move across a period from left to right, the ionisation potential increases with increase in atomic number. Thus, the first ionisation energy of Mg is higher than Mg, i.e.
INa < IMg.
But after removing one electron Na gets inert gas electronic configuration (1s2 2s2 2p6) , which is more stable. Hence, the second ionization potential of Na is higher than Mg, i.e.
IINa > IIMg .

Test: BITSAT Mock Test- 3 - Question 57

What is the amount of heat liberated (in k.cal) when one mole of aquesous NaOH reacted with one mole of aqueous HCl solution?

Test: BITSAT Mock Test- 3 - Question 58

Azo dyes are prepared from

Detailed Solution for Test: BITSAT Mock Test- 3 - Question 58

Correct Option is D

Test: BITSAT Mock Test- 3 - Question 59

The no. of unpaired electrons in the complex ion [CoF₆]3⁻ is (Atomic no. Co = 27)

Test: BITSAT Mock Test- 3 - Question 60

Which of the following has the largest atomic radius?

Test: BITSAT Mock Test- 3 - Question 61

Which of the following is formed when K₂Cr₂O₇ reacts with concentrated H₂SO₄ in cold?

Test: BITSAT Mock Test- 3 - Question 62

The unit of electrochemical equivalent is

Test: BITSAT Mock Test- 3 - Question 63

Among the following compounds (I-III), the correct order in reaction with electrophile is

Test: BITSAT Mock Test- 3 - Question 64

Increasing order of stability among the three main conformations (i.e.,Eclipse ,Anti,Gauche) of 2-fluoroethanol is

Test: BITSAT Mock Test- 3 - Question 65

Water can be tested by

Test: BITSAT Mock Test- 3 - Question 66

The number of moles of acid or base required by 1 litre of buffer to alter its pH by one unit is called