JEE Main Mock Test 19 - Online MCQ Exam

The chemical energy of the battery changes to:

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Your Answer:

mechanical energy mechanical energy
electrical potential energy electrical potential energy
atomic energy atomic energy
heat energy heat energy

The half-life of &15&3N is 6.5 s. A sample of this nuclide of hydrogen is observed for 32.5 s. The fraction of the original radioactive isotope remaining after this time is:

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Your Answer:

1 ⁄ 32 1 ⁄ 32
1 ⁄ 16 1 ⁄ 16
1 ⁄ 8 1 ⁄ 8
1 ⁄ 4 1 ⁄ 4

Which of the following is an intestinal disease caused by a parasite, entamoeba?

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Your Answer:

cholera cholera
dysentery dysentery
jaundice jaundice
hepatitis hepatitis

Priya thinks of a number x. She doubles it, adds 10, divides the result by 2, and finally subtracts the original number x. What is her final answer?

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Your Answer:

A) 10 A) 10
B) x B) x
C) 5 C) 5
D) 2 D) 2

Intensities are scaled by factors of:

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Your Answer:

20 20
100 100
10 10
1000 1000

By solving equation 6(9.3 - 3x) = 28x, the value of 'x' will be:

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Your Answer:

1.213 1.213
3.213 3.213
4.213 4.213
5.213 5.213

One milliampere (mA) is equal to:

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Your Answer:

10-9A 10-9A
10-6A 10-6A
10-3A 10-3A
10-6A 10-6A

The coefficient of restitution ($e$) for a perfectly inelastic collision is:

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Your Answer:

0 0
1 1
0.5 0.5
Infinite Infinite

Which of the following wave have better Penetrating Power?

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Your Answer:

Alpha Rays Alpha Rays
Gamma Rays Gamma Rays
X-rays X-rays
Beta rays Answer Beta rays Answer

The geographical area covered by a signal base station is known as a:

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Your Answer:

cell cell
cluster cluster
data data
transmitter transmitter

Out of 15 consecutive numbers, 2 are chosen at random. The probability that they are both odds or both primes is_________?

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Your Answer:

10/17 10/17
10/19 10/19
46/105 46/105
Cannot be determined Cannot be determined

Most stable hydride of nitrogen is:

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Your Answer:

$\ce{N2H4}$ $\ce{N2H4}$
$\ce{NH3}$ $\ce{NH3}$
$\ce{NH2OH}$ $\ce{NH2OH}$
$\ce{HN3}$ $\ce{HN3}$

The good conductors of heat is:

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Your Answer:

water water
wool wool
rubber rubber
metal metal

The prime factors of 40 are:

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Your Answer:

2 x 2 x 3 x 5 x 5 2 x 2 x 3 x 5 x 5
2 x 3 x 5 x 5 2 x 3 x 5 x 5
2 x 2 x 2 x 5 2 x 2 x 2 x 5
2 x 3 x 5 2 x 3 x 5

Which of the following will not form crystalline structure with opporitely charged ions_________________?

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Your Answer:

H+ H+
H- H-
Mg2+ Mg2+
Ca2+ Ca2+

Which one is not the partial pressure of oxygen in the lungs ?

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Your Answer:

0.1526 atm 0.1526 atm
116 mm of Hg 116 mm of Hg
116 torr 116 torr
1 atm 1 atm

Brass get discoloured in air due to constant exposure in presence of:?

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Your Answer:

Hydrogen sulphide Hydrogen sulphide
Aluminium sulphide Aluminium sulphide
Aluminium Phosphide Aluminium Phosphide
Hydrogenated wafers Answer Hydrogenated wafers Answer

The total number of electrons present in the first twenty elements of the periodic table is

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Your Answer:

A) 250 A) 250
B) 230 B) 230
C) 210 C) 210
D) 190 D) 190

The natural force that holds together elements together is called:

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Your Answer:

chemical bond chemical bond
force of attraction force of attraction
gravitational force gravitational force
physical bond physical bond

The number of reflexive closure of the relation {(0,1), (1,1), (1,3), (2,1), (2,2), (3,0)} on the set {0, 1, 2, 3} is________.

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Your Answer:

36 36
8 8
6 6
26 26

(a) α = a 2 + b 2 , β = ab (b) α = a 2 + b 2 , β = 2ab (c) α = a 2 + b 2 , β = a 2 – b 2 (d) α = 2ab, β = a 2 + b 2

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Your Answer:

A) α = a 2 + b 2 , β = ab A) α = a 2 + b 2 , β = ab
B) α = a 2 + b 2 , β = 2ab B) α = a 2 + b 2 , β = 2ab
C) α = a 2 + b 2 , β = a 2 – b 2 C) α = a 2 + b 2 , β = a 2 – b 2
D) α = 2ab, β = a 2 + b 2 D) α = 2ab, β = a 2 + b 2

An iron rod of length $L$ and square cross-section of side $a$ is pulled parallel to its length by a force $F$ acting at the two ends. The shear stress on a plane inclined at $45^\circ$ to the axis is:

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Your Answer:

$F/2a^2$ $F/2a^2$
$F/a^2$ $F/a^2$
$F/\sqrt{2}a^2$ $F/\sqrt{2}a^2$
Zero Zero

Elements which have properties of metals and non-metals are:

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Your Answer:

amorphous amorphous
crystalline crystalline
metalloids metalloids
metals metals

Which of the following is NOT a type of solution based on the physical state of the solvent?

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Your Answer:

A) Gaseous solution A) Gaseous solution
B) Liquid solution B) Liquid solution
C) Solid solution C) Solid solution
D) Heterogeneous solution D) Heterogeneous solution

Waves formed on water surface are

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Your Answer:

A) transverse A) transverse
B) longitudinal B) longitudinal
C) both longitudinal and transverse C) both longitudinal and transverse
D) neither longitudinal nor transverse D) neither longitudinal nor transverse

A ball impinges directly on a similar ball at rest. If the coefficient of restitution is $e$, the fraction of kinetic energy lost is:

1 Mark(s)

Your Answer:

$\frac{1}{2}(1-e^2)$ $\frac{1}{2}(1-e^2)$
$1-e^2$ $1-e^2$
$\frac{1}{4}(1-e^2)$ $\frac{1}{4}(1-e^2)$
$e^2$ $e^2$

Which one of the following is polar but compound is non-polar?

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Your Answer:

H 2 O H 2 O
HCl HCl
Co 2 Co 2
NH 3 Answer NH 3 Answer

A moving body is covering a distance directly proportional to the square of time. The acceleration of the body is:

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Your Answer:

A) decreasing A) decreasing
B) increasing B) increasing
C) constant C) constant
D) zero D) zero

A alone can finish a work in X days. B alone can finish the same work in X+5 days. Together, they take 6 days to complete the work. Find X

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Your Answer:

12 12
8 8
10 10
9 9

Fill in the blanks with numbers and boxes by signs, so that the expressions on both sides are equal.

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Your Answer:

A) 4 × (6 + 5) = 4 × 6 + 4 × 5 A) 4 × (6 + 5) = 4 × 6 + 4 × 5
B) (7 + 3) × 5 = 7 × 5 + 3 × 5 B) (7 + 3) × 5 = 7 × 5 + 3 × 5
C) 2 × (5 + 4) = 2 × 5 + 2 × ___________
D) (11 + 4) × 7= 11 × 7 + 4 × ___________ (e) 6 × (__________ + 8) = 6 × 4 + ___________ (f) (_______ + 7) × 4 = 12 × 4 + ____________

A scalene triangle has

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Your Answer:

A) one line of symmetry A) one line of symmetry
B) no line of symmetry B) no line of symmetry
C) two lines of symmetry C) two lines of symmetry
D) three lines of symmetry D) three lines of symmetry

Equivalent weight of base:

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Your Answer:

Molar mass Molar mass
Molar mass/acidity Molar mass/acidity
Molar mass × 2 Molar mass × 2
No meaning No meaning

When a wave from one medium enters into the second medium at some angle, its direction of travel changes. This phenomenon is known as:

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Your Answer:

refraction of waves refraction of waves
diffraction of waves diffraction of waves
reflection of waves reflection of waves
deflection of waves deflection of waves

Find the roots of the quadratic equation: 2×2 + 3x – 9 = 0?

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Your Answer:

3, -3/2 3, -3/2
3/2, -3 3/2, -3
-3/2, -3 -3/2, -3
3/2, 3 3/2, 3

Which of the following is produced when dead plant material decays in the absence of air?

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Your Answer:

chlorofluorocarbons (CFCs) chlorofluorocarbons (CFCs)
methane methane
carbon monoxide carbon monoxide
lead compounds lead compounds

What will be the numerical value of (4 sec2 300 + cos2 600 - tan2 450) / (sin2 300 + cos2 300)?

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Your Answer:

55/12 55/12
45/12 45/12
1/12 1/12
None of the above None of the above

Manish takes 26 hours to complete the whole work. If he works 3$\frac{1}{4}$ hours daily, in how many days he will finish 4 the work?

1 Mark(s)

Your Answer:

A) 9 days A) 9 days
B) 6 days 5 B) 6 days 5
C) 7 days C) 7 days
D) 8 days D) 8 days

What is the percentage of water from oceans?

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Your Answer:

0 0
0.002 0.002
0.006 0.006
0.97 0.97

A tunnel is dug along the diameter of the earth. If a particle of mass $m$ is dropped in it, the time period of oscillation is:

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Your Answer:

$84.6$ min $84.6$ min
$24$ hours $24$ hours
$42.3$ min $42.3$ min
Infinite Infinite

The ones digit of the cube of 23 is

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Your Answer:

A) 3 A) 3
B) 6 B) 6
C) 7 C) 7
D) 9 D) 9

Cis-trans isomerism requires:

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Your Answer:

Free rotation Free rotation
Restricted rotation Restricted rotation
Polar molecules Polar molecules
Nonpolar molecules Nonpolar molecules

Which of the following alloys contain(s) Cu and Zn?

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Your Answer:

Bronze Bronze
Brass Brass
Gun-metal Gun-metal
Type metal Type metal

A concave mirror of focal length $f_1$ is placed at a distance of $d$ from a convex lens of focal length $f_2$. A beam of light coming from infinity and falling on this convex lens - concave mirror combination returns to infinity. The distance $d$ must equal:

1 Mark(s)

Your Answer:

$f_1 + f_2$ $f_1 + f_2$
$f_2 + f_1$ $f_2 + f_1$
$f_2 + 2f_1$ $f_2 + 2f_1$
$2f_2 + f_1$ $2f_2 + f_1$

In the given figure, O is the centre of the circle. ∠AOB = ∠COD = 50° and CD = 5 cm then AB is equal to:

1 Mark(s)

Your Answer:

A) 2.5 cm A) 2.5 cm
B) 10 cm B) 10 cm
C) $\frac{10}{3}$ cm C) $\frac{10}{3}$ cm
D) 5 cm D) 5 cm

The unidirectional current is called:

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Your Answer:

alternating current alternating current
electric charge electric charge
direct current direct current
indirect current indirect current

The ratio of specific heats $\gamma = C_p/C_v$ for a diatomic gas (at rigid rotation) is:

1 Mark(s)

Your Answer:

1.67 1.67
1.4 1.4
1.33 1.33
1.5 1.5

Lanthanoid contraction is due to:

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Your Answer:

Good shielding Good shielding
Poor shielding by f-electrons Poor shielding by f-electrons
Increase in size Increase in size
Nuclear charge decrease Nuclear charge decrease

Two charges are placed in air, then in a medium with $K=81$. The force becomes:

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Your Answer:

$81F$ $81F$
$F/81$ $F/81$
$F/9$ $F/9$
$9F$ $9F$

A _______________ exerted by an object on another is a force.

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Your Answer:

A) Push or pull A) Push or pull
B) Contact or non-contact force B) Contact or non-contact force
C) Pressure C) Pressure
D) Magnitude D) Magnitude

30.9 * 3000 – 10.1 * 1100 + 8298 – 4302 = _________?

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Your Answer:

80000 80000
90000 90000
105000 105000
85000 85000

What is the order of kinetics in the SN1 mechanism ?

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Your Answer:

Zero Zero
First First
Second Second
Third Third

Products of a neutralisation reaction are always:

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Your Answer:

A) an acid and a base A) an acid and a base
B) an acid and a salt B) an acid and a salt
C) a salt and water C) a salt and water
D) a salt and a base D) a salt and a base

Cathode is a metalic plate where__________ takes place.

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Your Answer:

Oxidation Oxidation
Reduction Reduction
Redox Redox
Substitution Substitution

A soap bubble is given a negative charge. Its radius:

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Your Answer:

Increases Increases
Decreases Decreases
Remains same Remains same
Fluctuates Fluctuates

Which of the following group of forces can produce equilibrium?

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Your Answer:

12N, 5N, 20N 12N, 5N, 20N
4N ,2N, 10N 4N ,2N, 10N
10N, 18N 10N, 18N
12N, 5N, 15N 12N, 5N, 15N

The power radiated by a black body is $P_0$ at temperature $T_0$. If the temperature is raised to $3T_0$, the power radiated is:

1 Mark(s)

Your Answer:

$3 P_0$ $3 P_0$
$9 P_0$ $9 P_0$
$27 P_0$ $27 P_0$
$81 P_0$ $81 P_0$

The roots of the equation 3x² – 12x + 10 = 0 are?

1 Mark(s)

Your Answer:

rational and unequal rational and unequal
complex complex
real and equal real and equal
irrational and unequal irrational and unequal

A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered. If the area of the field is 680 sq. feet, how many feet of fencing will be required?

1 Mark(s)

Your Answer:

34 34
40 40
68 68
88 88

Assertion (A) The common factors of two numbers can never be greater than the smaller number. Reason (R) Factors are numbers that divide another number completely.

1 Mark(s)

Your Answer:

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

If a wire has a resistance of 0.5 ohm, then its conductance is:

1 Mark(s)

Your Answer:

1 S 1 S
1.5 S 1.5 S
2 S 2 S
5 S 5 S

Evaluating Your Answers

JEE Main Mock Test 19 : Question 1 of 60