JEE Main Mock Test 8 - Online MCQ Exam

The temperature of the thermosphere is up to:

1 Mark(s)

Your Answer:

120 °C 120 °C
1200 °C 1200 °C
1800 °C 1800 °C
1000 °C 1000 °C

Which of the following pair is not coprime?

1 Mark(s)

Your Answer:

A) 11, 12 A) 11, 12
B) 73, 74 B) 73, 74
C) 84, 94 C) 84, 94
D) 97, 98 D) 97, 98

A device to produce water waves and to study their characteristics is known as:

1 Mark(s)

Your Answer:

screw gauge screw gauge
ripple tank ripple tank
measuring cylinder measuring cylinder
wave container wave container

The main cause of acidity in the stomach is

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Your Answer:

A) release of extra gastric acids which decrease the pH level
B) indigestion and pain in large intestine
C) increase the pH level in the stomach C) increase the pH level in the stomach
D) release of extra bile juice which increases alkaline medium in stomach

Find the average of \$45, 50, 55, 60$

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Your Answer:

50 50
51 51
52.5 52.5
54 54

If the liquid is heated to increase the kinetic energy then the liquid will:

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Your Answer:

evaporate slowly evaporate slowly
evaporate faster evaporate faster
not evaporate not evaporate
boil boil

In a drawer there are 4 white socks, 3 blue socks and 5 grey socks. Two socks are picked randomly. What is the possibility that both the socks are of same color?

1 Mark(s)

Your Answer:

4/11 4/11
1 1
2/33 2/33
19/66 19/66

The area of the square formed on the diagonal of a rectangle as its side is 108 1/3 % more than the area of the rectangle. If the perimeter of the rectangle is 28 units, find the difference between the sides of the rectangle?

1 Mark(s)

Your Answer:

8 8
12 12
6 6
2 2

Find the average of \$55, 60, 65, 70$

1 Mark(s)

Your Answer:

60 60
61 61
62.5 62.5
64 64

The maximum value of friction is:

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Your Answer:

limiting friction limiting friction
unlimited friction unlimited friction
infinity infinity
none of above none of above

Splitting of spectral lines when atoms are Subjected to strong electric field is called?

1 Mark(s)

Your Answer:

Photoelectric Effect Photoelectric Effect
Zeeman Effect Zeeman Effect
Stark Effect Stark Effect
Compton Effect Answer Compton Effect Answer

Which of the following gives the correct increasing order of the atomic radii of O, F and N?

1 Mark(s)

Your Answer:

A) O, F, N A) O, F, N
B) N, F, O B) N, F, O
C) O, N, F C) O, N, F
D) F, O, N D) F, O, N

If the side of a square is increased by 30 %. Its area is increased by:_________?

1 Mark(s)

Your Answer:

9 % 9 %
30 % 30 %
60 % 60 %
69 % 69 %

The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:_______?

1 Mark(s)

Your Answer:

Bromine Bromine
Fluorine Fluorine
Chlorine Chlorine
Sulphur Sulphur

The product of the area of three adjacent faces of a rectangular box is equal to___________?

1 Mark(s)

Your Answer:

the volume of the box the volume of the box
Twice the volume of the box Twice the volume of the box
the square of the volume of the box the square of the volume of the box
Cube root of the volume of the box Cube root of the volume of the box

Consider a car moving on a banked road (angle $\theta$) with radius $r$. If friction coefficient is $\mu$, the maximum safe speed is:

1 Mark(s)

Your Answer:

$\sqrt{rg \left(\frac{\mu + \tan\theta}{1 - \mu \tan\theta}\right)}$
$\sqrt{rg \tan\theta}$ $\sqrt{rg \tan\theta}$
$\sqrt{rg \mu}$ $\sqrt{rg \mu}$
$\sqrt{rg \left(\frac{1 - \mu \tan\theta}{\mu + \tan\theta}\right)}$

Which of the following appliances is based on the magnetic effect of electric current

1 Mark(s)

Your Answer:

A) Electric bell A) Electric bell
B) Electric iron B) Electric iron
C) Water heater C) Water heater
D) Electric stove D) Electric stove

The thermosphere is situated above:

1 Mark(s)

Your Answer:

12 Km 12 Km
50 Km 50 Km
80 Km 80 Km
10 Km 10 Km

A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half?

1 Mark(s)

Your Answer:

15 min 15 min
20 min 20 min
27.5 min 27.5 min
30 min 30 min

The Least Common Multiple of 112 and 64 is:

1 Mark(s)

Your Answer:

448 448
488 488
478 478
468 468

A plane flies at Mach 2. The angle of the shock cone (Mach cone) is:

1 Mark(s)

Your Answer:

$30^\circ$ $30^\circ$
$60^\circ$ $60^\circ$
$45^\circ$ $45^\circ$
$90^\circ$ $90^\circ$

Radioactive decay releases:

1 Mark(s)

Your Answer:

Only heat Only heat
Only electricity Only electricity
Energy as particles/rays Energy as particles/rays
Only sound Only sound

At what temperature is the Fahrenheit scale reading equal to twice that of the Celsius scale?

1 Mark(s)

Your Answer:

460°C 460°C
280°C 280°C
360°C 360°C
160°C 160°C

German silver contains:

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Your Answer:

Ag and Cu Ag and Cu
Ag and Zn Ag and Zn
Cu and Ag Cu and Ag
Cu, Zn, Ni Cu, Zn, Ni

The number if decreased by 25% becomes 150. The original number before decrease was:

1 Mark(s)

Your Answer:

240 240
220 220
230 230
200 200

Sucrose, lactose, and maltose are classified as:

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Your Answer:

monosaccharides monosaccharides
disaccharides disaccharides
polysaccharides polysaccharides
Trisaccharides Trisaccharides

The sum of the digits of a two-digit number is \$12$. If the digits are reversed, the new number is \$18$ less than the original. Find the original number.

1 Mark(s)

Your Answer:

57 57
65 65
73 73
75 75

The condensed structural formula of Stearic acid is:

1 Mark(s)

Your Answer:

CH3-CH2-CH2-COOH CH3-CH2-CH2-COOH
CH3-(CH2)4-COOH CH3-(CH2)4-COOH
CH3-(CH2)14-COOH CH3-(CH2)14-COOH
CH3-(CH2)16-COOH CH3-(CH2)16-COOH

In an angle, the rays of the angle are known as:

1 Mark(s)

Your Answer:

arms arms
vertex vertex
point of intersection point of intersection
initial side initial side

The radius of a wire is decreased to one –third if volume remains the same length will increase

1 Mark(s)

Your Answer:

1 Time 1 Time
3 times 3 times
6 times 6 times
9 times 9 times

What is the total amount of water present on Earth?

1 Mark(s)

Your Answer:

1.33 billion cubic kilometers 1.33 billion cubic kilometers
1.33 billion cubic meters 1.33 billion cubic meters
1.33 million cubic kilometers 1.33 million cubic kilometers
1.33 million cubic meters 1.33 million cubic meters

Complement of a set B in denoted by:

1 Mark(s)

Your Answer:

B' B'
B° B°
{B} {B}
B² B²

Which of the following is used as a fuel for buses, trucks, and trains?

1 Mark(s)

Your Answer:

diesel diesel
lubricating oil lubricating oil
fuel oil fuel oil
bitumen bitumen

When light travelling in a certain medium falls on the surface of another medium, a part of it turns back in the same medium. This phenomenon is called:

1 Mark(s)

Your Answer:

reflection reflection
refraction refraction
diffraction diffraction
acoustics acoustics

Which of the following possesses maximum hydration energy ?

1 Mark(s)

Your Answer:

Na+ Na+
K+ K+
Mg+2 Mg+2
Ca+2 Ca+2

Consider the following reaction- 3Cl2 + 6NaOH ? NaClO3 + 5NaCl + 3H2O This reaction is_______________?

1 Mark(s)

Your Answer:

Displacement reaction Displacement reaction
Double displacement reaction Double displacement reaction
Disproportionation reaction Disproportionation reaction
Reduction reaction Reduction reaction

If 20% of a number, then 120% of that number will be_________?

1 Mark(s)

Your Answer:

20 20
120 120
360 360
720 720

A 5% solution of cane-sugar (molecular weight = 342) is isotonic with 1% solution of substance A. The molecular weight of X is

1 Mark(s)

Your Answer:

A) 342 A) 342
B) 171.2 B) 171.2
C) 68.4 C) 68.4
D) 136.8 D) 136.8

Loudness of sound depends primarily on:

1 Mark(s)

Your Answer:

Frequency Frequency
Amplitude Amplitude
Wavelength Wavelength
Speed Speed

Out of the following, the one angle which is obtuse is:

1 Mark(s)

Your Answer:

11⁄21 of a right angle 11⁄21 of a right angle
11⁄21 of a complete rotation 11⁄21 of a complete rotation
8⁄20 of a complete rotation 8⁄20 of a complete rotation
8⁄20 of a right angle 8⁄20 of a right angle

Among halogens the highest boiling point is of___________________?

1 Mark(s)

Your Answer:

Flrorine Flrorine
Chlorine Chlorine
Bromine Bromine
Iodine Iodine

Afnan wants to borrow Rs.6000 at rate of interest 6% p.a. at S.I and lend the same amount at C.I at same rate of interest for two years. What would be his income in the above transaction?

1 Mark(s)

Your Answer:

Rs.21.60 Rs.21.60
Rs.24.00 Rs.24.00
Rs.25.20 Rs.25.20
Rs.27.80 Rs.27.80
None of these None of these

If cos -1 x + sin -1 x = π, then the value of x is

1 Mark(s)

Your Answer:

A) $\frac{3}{2}$ A) $\frac{3}{2}$
B) $\frac{1}{\sqrt{2}}$ B) $\frac{1}{\sqrt{2}}$
C) $\frac{\sqrt{3}}{2}$ C) $\frac{\sqrt{3}}{2}$
D) $\frac{2}{\sqrt{3}}$ (\frac{\sqrt{3}}{2}\)

The boiling point of lubricating oil is:

1 Mark(s)

Your Answer:

270 °C to 340 °C 270 °C to 340 °C
350 °C to 500 °C 350 °C to 500 °C
500 °C to 600 °C 500 °C to 600 °C
more than 500 °C more than 500 °C

SN1 reaction is favored by:

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Your Answer:

Polar protic solvent Polar protic solvent
Non-polar solvent Non-polar solvent
Aprotic solvent Aprotic solvent
No solvent No solvent

Ore of mercury is called:

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Your Answer:

galena galena
zinc blende zinc blende
cinnabar cinnabar
chromite chromite

The figure

1 Mark(s)

Your Answer:

A) one line of symmetry A) one line of symmetry
B) two lines of symmetry B) two lines of symmetry
C) no line of symmetry C) no line of symmetry
D) none of above D) none of above

The smallest possible division up to which an instrument can measure is called:

1 Mark(s)

Your Answer:

large count large count
least count least count
small count small count
shortest length shortest length

Electric current has a single path through the circuit in:

1 Mark(s)

Your Answer:

random combination random combination
series combination series combination
parallel combination parallel combination
circular combination circular combination

Separation of a solid from its hot saturated solution by cooling is called__________________?

1 Mark(s)

Your Answer:

vapourization vapourization
solvent extraction solvent extraction
filtration filtration
crystallization crystallization

Which is lyophilic colloid?

1 Mark(s)

Your Answer:

Starch Starch
$\ce{As2S3}$ $\ce{As2S3}$
Gold sol Gold sol
$\ce{Fe(OH)3}$ $\ce{Fe(OH)3}$

Which one is true for internal energy ?

1 Mark(s)

Your Answer:

It is sum of all forms of energies associated with molecules of a system
It is a state function of a system It is a state function of a system
It is proportional to transnational K.E of the molecules
All are correct All are correct

The increase in ab when bis increased by 1 is

1 Mark(s)

Your Answer:

A) b A) b
B) ab B) ab
C) a C) a
D) None of these D) None of these

PH method was proposed by:

1 Mark(s)

Your Answer:

Arrhenius Arrhenius
Soren Sorenson Soren Sorenson
Lewis Lewis
Bohr Bohr

Which branch of science plays an important role in the development of technology and engineering ?

1 Mark(s)

Your Answer:

Chemistry Chemistry
Physics Physics
Geology Geology
Biology Biology

If a rectangular tank is 21cm long, 13cm wide and 18cm high and contains water up to a height of 11cm then the volume of water in liters is:

1 Mark(s)

Your Answer:

4.003 liters 4.003 liters
5.003 liters 5.003 liters
3.003 liters 3.003 liters
2.003 liters 2.003 liters

The speed of a transverse wave on a stretched string is given by:

1 Mark(s)

Your Answer:

$\sqrt{T \mu}$ $\sqrt{T \mu}$
$T/\mu$ $T/\mu$
$\sqrt{T/\mu}$ $\sqrt{T/\mu}$
$\sqrt{\mu/T}$ $\sqrt{\mu/T}$

Denaturation of protein leads to loss of its biological activity by

1 Mark(s)

Your Answer:

A) formation of amino acids A) formation of amino acids
B) loss of primary structure B) loss of primary structure
C) loss of both primary and secondary structure
D) loss of both secondary and tertiary structures

mRNA carries information for:

1 Mark(s)

Your Answer:

DNA replication DNA replication
Protein synthesis Protein synthesis
Energy Energy
Structure Structure

$dsp^2$ hybridization gives:

1 Mark(s)

Your Answer:

Square planar Square planar
Tetrahedral Tetrahedral
Trigonal planar Trigonal planar
Octahedral Octahedral

The area of a rectangular sheet of paper is 20 cm2. Its length is 5 cm. Find its width.

1 Mark(s)

Your Answer:

A) 1 cm A) 1 cm
B) 2 cm B) 2 cm
C) 3 cm C) 3 cm
D) 4 cm. D) 4 cm.

Which of the following is not a pyrimidine?

1 Mark(s)

Your Answer:

A) Uracil A) Uracil
B) Cytosine B) Cytosine
C) Guanine C) Guanine
D) Thymine D) Thymine

The length of the rectangular field is double its width. Inside the field there is square shaped pond 8m long. If the area of the pond is 1/8 of the area of the field. What is the length of the field?

1 Mark(s)

Your Answer:

31 m 31 m
32 m 32 m
16 m 16 m
20 m 20 m

The area of a rectangle is \$180$ cm² and its length is \$15$ cm. Find its perimeter.

1 Mark(s)

Your Answer:

50 cm 50 cm
52 cm 52 cm
56 cm 56 cm
54 cm 54 cm

If the number A381 is divisible by 11, then what is the value of A?

1 Mark(s)

Your Answer:

7 7
3 3
1 1
8 8

After spending 40 % in machinery, 25 % in the building, 15 % in raw material and 5 % on furniture, Haris had a balance of Rs. 1305. The money with him was:________?

1 Mark(s)

Your Answer:

Rs. 6500 Rs. 6500
Rs. 7225 Rs. 7225
Rs. 8700 Rs. 8700
Rs. 1390 Rs. 1390

The oxidation state of nickel in |(Ni(CO 4 )| is

1 Mark(s)

Your Answer:

A) 1 A) 1
B) 4 B) 4
C) 2 C) 2
D) 3 D) 3

Evaluating Your Answers

JEE Main Mock Test 8 : Question 1 of 67