JEE Main Mock Test 5 - Online MCQ Exam

When two charges are placed in water then the Coulomb force between them reduces to _____________?

1 Mark(s)

Your Answer:

1/2 times 1/2 times
1/3 times 1/3 times
1/78 times 1/78 times
1/58 times 1/58 times

The matrix A = $\left[\begin{array}{ll} 0 & 1 \\ 1 & 0 \end{array}\right]$ is a

1 Mark(s)

Your Answer:

A) unit matrix A) unit matrix
B) diagonal matrix B) diagonal matrix
C) symmetric matrix C) symmetric matrix
D) skew-symmetric matrix D) skew-symmetric matrix

One mole of an ideal gas expands from volume $V_1$ to $V_2$ at constant temperature $T$. The heat absorbed is:

1 Mark(s)

Your Answer:

$RT \ln(V_2/V_1)$ $RT \ln(V_2/V_1)$
$RT(V_2-V_1)$ $RT(V_2-V_1)$
$RT \ln(V_1/V_2)$ $RT \ln(V_1/V_2)$
Zero Zero

Charle’s Law was given by Jacques Charles in_______?

1 Mark(s)

Your Answer:

1785 1785
1787 1787
1880 1880
1885 1885

A bundle of thousands of optical fibers bonded together is called:

1 Mark(s)

Your Answer:

diopters diopters
heat pipe heat pipe
light pipe light pipe
microscope microscope

What is the S.I unit of activity?

1 Mark(s)

Your Answer:

becquerel becquerel
curie curie
candela candela
henry Answer henry Answer

A mixture contains wine and water in ratio \$5:3$. If \$16$ liters of water is added, the ratio becomes \$5:7$. Find the original quantity of wine.

1 Mark(s)

Your Answer:

15 liters 15 liters
20 liters 20 liters
25 liters 25 liters
30 liters 30 liters

If $6x = 42$, find $x$

1 Mark(s)

Your Answer:

5 5
6 6
7 7
8 8

Flame test for calcium gives:

1 Mark(s)

Your Answer:

Yellow Yellow
Blue Blue
Brick red Brick red
Green Green

The distance between 2 consecutive crests or troughs is called:

1 Mark(s)

Your Answer:

time period time period
amplitude amplitude
frequency frequency
wave length wave length

The radiations with highest speed are _______.

1 Mark(s)

Your Answer:

Alpha radiations Alpha radiations
Gamma radiations Gamma radiations
Beta radiations Beta radiations
AOT AOT

How is the fractional number for ‘3 out of 7 of the fruits are apples’ written?

1 Mark(s)

Your Answer:

A) $\frac{3}{7}$ A) $\frac{3}{7}$
B) $\frac{7}{3}$ B) $\frac{7}{3}$
C) $\frac{4}{7}$ C) $\frac{4}{7}$
D) $\frac{4}{3}$ (\frac{3}{7}\) D) $\frac{4}{3}$ (\frac{3}{7}\)

Vinegar is a solution of

1 Mark(s)

Your Answer:

A) 50% – 60% acetic acid in alcohol A) 50% – 60% acetic acid in alcohol
B) 5% – 8% acetic acid in alcohol B) 5% – 8% acetic acid in alcohol
C) 5% – 8% acetic acid in water C) 5% – 8% acetic acid in water
D) 50% – 60% acetic acid in water D) 50% – 60% acetic acid in water

If 4sin2 θ = 3, and θ is a positive acute angle, what is the value of tan θ - cot θ/2?

1 Mark(s)

Your Answer:

4 4
0 0
-2 -2
-1 -1

Find the HCF of \$8$ and \$12$

1 Mark(s)

Your Answer:

2 2
3 3
6 6
4 4

The difference between a discount of 40% on Rs. 500 and two successive discount of 36% and 4% on the same amount is:________?

1 Mark(s)

Your Answer:

0 0
Rs. 2 Rs. 2
Rs. 1.93 Rs. 1.93
Rs. 7.20 Rs. 7.20

The ratio of numbers is 3:4 and their H.C.F is 4. Their L.C.M is__________?

1 Mark(s)

Your Answer:

12 12
16 16
24 24
48 48

Assertion (A) If x + y = 17and x – y = 3 then the value of x 2 + y 2 is 149. Reason (R) (a + b) 2 – (a – b) 2 = 4ab

1 Mark(s)

Your Answer:

A) Both A and R are correct and R is the correct explanation of A.
B) Both A and R are correct 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. D) A is false but R is true.

Mirage is an example of ___________?

1 Mark(s)

Your Answer:

reflection of light reflection of light
refraction of light refraction of light
Refraction and total internal reflection of light
Scattering of light Scattering of light

The value of (2.75)³ – (2.00)³ – (0.75)³ is__________?

1 Mark(s)

Your Answer:

3 * 2.75 * 2.75 * 2.75 3 * 2.75 * 2.75 * 2.75
3 * 2.00 * 2.00 * 2.00 3 * 2.00 * 2.00 * 2.00
3 * 2.75 * 0.75 * 2.75 3 * 2.75 * 0.75 * 2.75
4.5 * 2.75 4.5 * 2.75

Which one of the following elements exhibit maximum number of valence electrons?

1 Mark(s)

Your Answer:

A) Na A) Na
B) Al B) Al
C) Si C) Si
D) P D) P

The force between two bodies having charges 500μC and 100μC separated by a distance of 0.5m in the air is:

1 Mark(s)

Your Answer:

1800 N 1800 N
1000 N 1000 N
2200 N 2200 N
300 N 300 N

One micro coulomb is equal to:

1 Mark(s)

Your Answer:

10-6 10-6
10-8 10-8
10-4 10-4
10-9 10-9

Acetone reacts with HCN to form a cyanohydrin. It is an example of________________?

1 Mark(s)

Your Answer:

electronphilic addition electronphilic addition
electrophilic substitution electrophilic substitution
nucleophilic addition nucleophilic addition
nucleophilic substitution nucleophilic substitution

A ball of 150 g is hit with a bat; the ball starts travelling with a velocity of 3m/s. What is the momentum of the ball?

1 Mark(s)

Your Answer:

A) 0.05 kg m/s A) 0.05 kg m/s
B) 0.45 kg m/s B) 0.45 kg m/s
C) 50 kg m/s C) 50 kg m/s
D) 450 kg m/s 45 kg m/s D) 450 kg m/s 45 kg m/s

When a compressed gas is allowed to pass through a nozzle of a jet into a region of low pressure it produces?

1 Mark(s)

Your Answer:

Fusion Fusion
Cooling Cooling
Expansion Expansion
Vaporization Answer Vaporization Answer

The Length of a plot is four times is breadth. A playground measuring 1200 square meters occupies a third of the total area of the plot. What is the length of the plot in meters?

1 Mark(s)

Your Answer:

20 20
30 30
60 60
None of these None of these

The half cells are interconnected through________________?

1 Mark(s)

Your Answer:

wire wire
salt bridge salt bridge
electric circuit electric circuit
no connection exists no connection exists

Kipps Apparatus is used to prepare_________?

1 Mark(s)

Your Answer:

NaOH NaOH
Cl² Cl²
H²S H²S
Cu Cu

The chemical symbol for sodium is:

1 Mark(s)

Your Answer:

A) Na A) Na
B) Na B) Na
C) So C) So
D) Sd D) Sd

A molded plastic disc on which digital data is stored in the form of microscopic reflecting and non-reflecting spots is known as:

1 Mark(s)

Your Answer:

audio cassette audio cassette
floppy disk floppy disk
hard disk hard disk
compact disc compact disc

The time T of the simple harmonic motion of a mass m attached to a spring is given by:

1 Mark(s)

Your Answer:

T = 2π √(k/m) T = 2π √(k/m)
T = 2π √(m/k) T = 2π √(m/k)
T = π √(k/m) T = π √(k/m)
T = 2π √(m+k) T = 2π √(m+k)

Which noble gas is most abundant?

1 Mark(s)

Your Answer:

Helium Helium
Argon Argon
Neon Neon
Krypton Krypton

How many bonds are formed by carbon with other atoms?

1 Mark(s)

Your Answer:

two two
three three
four four
five five

Catalyst used to speed up the reaction of ammonia synthesis is________________________?

1 Mark(s)

Your Answer:

V2O5 V2O5
V2O5 and Pt V2O5 and Pt
Fe Fe
Pieces of Fe crystals are embedded in fused mixture of MgO Al2O3 and SiO2

Zwitter ion is:

1 Mark(s)

Your Answer:

Cation Cation
Dipolar ion Dipolar ion
Anion Anion
Neutral Neutral

Evaluating Your Answers

JEE Main Mock Test 5 : Question 1 of 36