JEE Main Mock Test 20 - Online MCQ Exam

Which functional group is characteristics of ester?

1 Mark(s)

Your Answer:

R-OR R-OR
R-CO-R R-CO-R
R-CO-OR R-CO-OR
R-CO-OH Answer R-CO-OH Answer

43% of 784 = ________?

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Your Answer:

312.73 312.73
373.12 373.12
337.12 337.12
339.12 339.12

Which of the following is a disease that proceeds from obstruction of the liver?

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Your Answer:

cholera cholera
dysentery dysentery
jaundice jaundice
hepatitis hepatitis

The size of the pupil is controlled by:

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Your Answer:

cornea cornea
chord chord
retina retina
iris iris

If x = 10, then 4x 2 + 20x + 25 =

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Your Answer:

A) 256 A) 256
B) 425 B) 425
C) 625 C) 625
D) 575 (A) and the other labelled as Reason (R). Select the correct answer from the options (a), (b), (c), and

The highly conducting state of matter is:

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Your Answer:

plasma plasma
solid solid
liquid liquid
gas gas

A motion in which a body moves along a line without any rotation is known as:

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Your Answer:

translatory motion translatory motion
rotatory motion rotatory motion
vibratory motion vibratory motion
rest rest

The acceleration due to gravity ($g$) at the center of the Earth is:

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Your Answer:

$9.8 m/s^2$ $9.8 m/s^2$
Zero Zero
Infinite Infinite
$4.9 m/s^2$ $4.9 m/s^2$

The unit of area is:

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Your Answer:

meter² meter²
meter³ meter³
meter meter
C C

Among the halogens the rare element is________________?

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Your Answer:

Fluorine Fluorine
Chlorine Chlorine
Astatine Astatine
Iodine Iodine

The altitude of an equilateral triangle of side 2√3 cm is_________?

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Your Answer:

3/2 cm 3/2 cm
1/2 cm 1/2 cm
3/4 cm 3/4 cm
3 cm 3 cm

A line going through the midpoint from one side to the other side of a circle is called:

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Your Answer:

angle angle
area area
radius radius
diameter diameter

As the number of carbon atoms increases, the number of possible isomers:

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Your Answer:

increases increases
decreases decreases
remains same remains same
becomes zero becomes zero

Heatwaves are:

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Your Answer:

electromagnetic electromagnetic
mechanical mechanical
transverse transverse
chemical waves chemical waves

When a standard is set for a quantity, then the standard quantity is called a:

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Your Answer:

amount amount
rate rate
prefix prefix
unit unit

If 4 quantities a, b, c and d are related as a : b : : c : d then d is called:

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Your Answer:

third proportional third proportional
fourth proportional fourth proportional
mean proportional mean proportional
continued proportional continued proportional

The changing of a liquid into vapors from the surface of the liquid without heating it is called:

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Your Answer:

expansion expansion
contraction contraction
evaporation evaporation
fusion fusion

A money lender lends Rs.2000 for six months at 20% p.a. rate. It the interest is reckoned quarterly than find the amount given after time limit.

1 Mark(s)

Your Answer:

Rs.2205 Rs.2205
Rs.2200 Rs.2200
Rs.2160 Rs.2160
Rs.2040 Rs.2040

The value of $\frac{48}{6}$ is:

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Your Answer:

8 8
7 7
9 9
6 6

Dehydration of alcohols gives:

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Your Answer:

More substituted alkene More substituted alkene
Less substituted alkene Less substituted alkene
Alkane Alkane
Ether Ether

What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30?

1 Mark(s)

Your Answer:

196 196
630 630
1260 1260
2520 2520

What should be added to $\frac{11}{17}$ to make it $\frac{15}{17}$?

1 Mark(s)

Your Answer:

A) $\frac{26}{17}$ A) $\frac{26}{17}$
B) 4 B) 4
C) $\frac{4}{17}$ C) $\frac{4}{17}$
D) $\frac{4}{34}$ (\frac{4}{17}\) D) $\frac{4}{34}$ (\frac{4}{17}\)

In an election between two candidates A and B, the number of valid votes received by A exceeds those received by B by 15% of the total number of votes polled. If 20% of the votes polled were invalid and a total of 8720 votes were polled, then how many valid votes did B get?

1 Mark(s)

Your Answer:

2160 2160
2420 2420
2834 2834
3150 3150
None of these None of these

The hardness that can be removed by boiling is called:

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Your Answer:

temporary hardness temporary hardness
permanent hardness permanent hardness
semi temporary hardness semi temporary hardness
semi permanent hardness semi permanent hardness

There were two candidates in an election. Winner candidate received 62% of votes and won the election by 288 votes. Find the number of votes casted to the winning candidate?

1 Mark(s)

Your Answer:

456 456
744 744
912 912
1200 1200

Assertion (A) ABC is an equilateral triangle such that AB = BC = CA and ∠A = ∠B = ∠C = 60°. Reason (R) Equilateral triangle has all its sides equal and each angle measure 30°.

1 Mark(s)

Your Answer:

A) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C) Assertion is true but Reason is false.
D) Assertion is false but Reason is true.

Which one of the following reactants will be required to form straight chain alcohol by using Grignard reagent________________?

1 Mark(s)

Your Answer:

formaldehyde formaldehyde
ketone ketone
ethylene epoxide ethylene epoxide
both A & C both A & C

In the algebraic fractions, the numerators and denominators are:

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Your Answer:

polynomials polynomials
odd numbers odd numbers
even numbers even numbers
surds surds

An object undergoes free fall. Its acceleration is:

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Your Answer:

Zero Zero
Variable Variable
Constant ($g$) Constant ($g$)
Increasing Increasing

$\left|\begin{array}{ccc} (b+c)^{2} & a^{2} & b c \\ (c+a)^{2} & b^{2} & c a \\ (a+b)^{2} & c^{2} & a b \end{array}\right|=$

1 Mark(s)

Your Answer:

A) (a – b)(b – c)(c – a)(a 2 + b 2 + c 2 )
B) -(a – b)(b – c)(c – a) B) -(a – b)(b – c)(c – a)
C) (a – b)(b – c)(c – a)(a + b + c)(a 2 + b 2 + c 2 )
D) 0 (a – b)(b – c)(c – a)(a + b + c)(a 2 + b 2 + c 2 )

In a battery, the separation of charges sets up:

1 Mark(s)

Your Answer:

potential difference potential difference
current current
charges charges
resistance resistance

Two trains 140 metres and 120 metres are running in the same direction with speeds 40 kmph and 60 kmph respectively. In what time will the faster train pass the slower one?

1 Mark(s)

Your Answer:

0.60 minutes 0.60 minutes
0.36 minutes 0.36 minutes
0.78 minutes 0.78 minutes
0.42 minutes 0.42 minutes

Find the lowest common multiple of 24, 36 and 40.

1 Mark(s)

Your Answer:

120 120
240 240
360 360
480 480

A man buys 10 articles for Rs. 8 and Sells them at the rate of Rs. 1.25 per article. His gain is:________?

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Your Answer:

20% 20%
50% 50%
19 ½ % 19 ½ %
56 ¼ % 56 ¼ %

A fruit vendor purchased 20 dozens of bananas at Rs. 15 per dozen. But one-fourth of the bananas were rotten and had to be thrown away. He sold two-third of the remaining bananas at Rs. 22.50 per dozen. At what price per dozen should he sell the remaining bananas to make neither a profit nor a loss?

1 Mark(s)

Your Answer:

Rs. 20 Rs. 20
Rs. 15 Rs. 15
Rs. 22.50 Rs. 22.50
Rs. 7.50 Rs. 7.50
None of these None of these

2 mL each of concentrated HCl, HNO 3 and a mixture of concentrated HCl and concentrated HNO 3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be

1 Mark(s)

Your Answer:

A) Al A) Al
B) Au B) Au
C) Cu C) Cu
D) Pt D) Pt

A prism has an angle $A$. A ray is incident at an angle $i$ and emerges normally from the other face. The angle of incidence $i$ is roughly ($\mu$ is index):

1 Mark(s)

Your Answer:

$A/\mu$ $A/\mu$
$A$ $A$
$\mu A$ $\mu A$
$\mu/A$ $\mu/A$

A.C. and D.C. have the same __________?

1 Mark(s)

Your Answer:

Affect in charging a capacitor Affect in charging a capacitor
Affect in charging a battery Affect in charging a battery
Affect while passing through an inductance
Heating effect through a resistance Heating effect through a resistance

Naturally occurring metallic compounds are called:

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Your Answer:

metalloids metalloids
minerals minerals
hard solids hard solids
soft solids soft solids

Which of the following is more Basic in nature?

1 Mark(s)

Your Answer:

Ammonia Ammonia
1°Alkyl ammine 1°Alkyl ammine
2° Alkyl ammine 2° Alkyl ammine
3° Alkyl ammine 3° Alkyl ammine

A rational number lying between √2 and √3 is :

1 Mark(s)

Your Answer:

A) $\frac{\sqrt{2}+\sqrt{3}}{2}$ A) $\frac{\sqrt{2}+\sqrt{3}}{2}$
B) √6 B) √6
C) 1.6 C) 1.6
D) 1.9 6 D) 1.9 6

In the above given reaction, alkaline KMnO 4 acts as

1 Mark(s)

Your Answer:

A) reducing agent A) reducing agent
B) oxidising agent B) oxidising agent
C) catalyst C) catalyst
D) dehydrating agent D) dehydrating agent

A train travels \$240$ km at a uniform speed. If the speed had been \$8$ km/h more, it would have taken $1$ hour less for the same journey. Find the original speed.

1 Mark(s)

Your Answer:

32 km/h 32 km/h
36 km/h 36 km/h
40 km/h 40 km/h
48 km/h 48 km/h

'Cyclotron', a device used to accelerate charged particles, was invented by:

1 Mark(s)

Your Answer:

Rutherford Rutherford
Bohr Bohr
E.O. Lawrence E.O. Lawrence
Einstein Einstein

Sound waves with frequency below 20 Hz are called:

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Your Answer:

Infrasonic Infrasonic
Ultrasonic Ultrasonic
Audible Audible
Supersonic Supersonic

The dimensional formula for acceleration is:

1 Mark(s)

Your Answer:

$[LT^{-2}]$ $[LT^{-2}]$
$[LT^{-1}]$ $[LT^{-1}]$
$[L^2T^{-2}]$ $[L^2T^{-2}]$
$[MLT^{-2}]$ $[MLT^{-2}]$

The echo of sound is more prominent if the surface is:

1 Mark(s)

Your Answer:

soft soft
rigid rigid
porous porous
smooth smooth

$\frac{1}{4}+\frac{1}{4}+\frac{1}{4}+\frac{1}{4}$ =

1 Mark(s)

Your Answer:

A) 1 A) 1
B) 2 B) 2
C) 4 C) 4
D) 8 D) 8

The body jumps out of a moving van. There is a danger for him to fall in:

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Your Answer:

towards the moving van towards the moving van
away from the van away from the van
direction of motion direction of motion
under the van under the van

Which of the following represents a chemical change?

1 Mark(s)

Your Answer:

A) Rusting of iron foil A) Rusting of iron foil
B) Melting of glacier B) Melting of glacier
C) Crushing a peace of chalk into powder
D) Folding sheets of papers to create new objects.

The number of methods to find L.C.M is/are:

1 Mark(s)

Your Answer:

4 4
3 3
2 2
1 1

What will be the order of reaction of a reaction whose rate can be expressed as R = K [A] [B] ?

1 Mark(s)

Your Answer:

Zero Zero
One One
Two Two
Three Three

The transfer of information from one place to another through different electronic and optical equipment is termed as:

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Your Answer:

gap of information gap of information
flow of information flow of information
transit information transit information
information collapse information collapse

The de Broglie wavelength is given by:

1 Mark(s)

Your Answer:

$\lambda = hmv$ $\lambda = hmv$
$\lambda = \frac{h}{mv}$ $\lambda = \frac{h}{mv}$
$\lambda = \frac{mv}{h}$ $\lambda = \frac{mv}{h}$
$\lambda = \frac{h}{m+v}$ $\lambda = \frac{h}{m+v}$

The mass number of an atom is:

1 Mark(s)

Your Answer:

number of protons only number of protons only
number of neutrons only number of neutrons only
number of electrons number of electrons
number of protons and neutrons number of protons and neutrons

Which of the following is a 'classical' physics concept that fails at the microscopic level?

1 Mark(s)

Your Answer:

Conservation of Energy Conservation of Energy
Superposition Superposition
Determinism/Definite Trajectory Determinism/Definite Trajectory
Wave propagation Wave propagation

Calculate the Average of 1,2,3,4,5.

1 Mark(s)

Your Answer:

1 1
2 2
3 3
4 4

Evaluating Your Answers

JEE Main Mock Test 20 : Question 1 of 57