JEE Main Mock Test 4 - Online MCQ Exam

Photochemical smog is related to pollution if

1 Mark(s)

Your Answer:

A) Air A) Air
B) Water B) Water
C) Soil C) Soil
D) None of these D) None of these

The halogen which reacts spontaneously with gold (Au) to form Au+3 is ________________?

1 Mark(s)

Your Answer:

F2 F2
Cl2 Cl2
Br2 Br2
I2 I2

Some kind of rays were emitted from the cathode, called:

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Your Answer:

proton rays proton rays
cathode rays cathode rays
isotope's rays isotope's rays
emission rays emission rays

X-ray waves, television waves and radio waves are the examples of:

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Your Answer:

mechanical waves mechanical waves
transverse waves transverse waves
longitudinal waves longitudinal waves
electromagnetic waves electromagnetic waves

The top of a table is 1 m 20 cm wide and 1 m 50 cm long. The perimeter of this top is

1 Mark(s)

Your Answer:

A) 5.30 m A) 5.30 m
B) 5.40 m B) 5.40 m
C) 5.50.m C) 5.50.m
D) 5.60 m 40 m D) 5.60 m 40 m

Who used the term Concentrationwindow to draw the arbitrary lines of demarcation

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Your Answer:

Einstein Einstein
Dr.A.Walash Dr.A.Walash
Schwartz Schwartz
S.E.Manhan S.E.Manhan

The difference between compound interest and simple interest on a sum for \$2$ years at \$10\%$ per annum is $₹50$. Find the sum.

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Your Answer:

₹4500 ₹4500
₹5000 ₹5000
₹5500 ₹5500
₹6000 ₹6000

A convex lens of focal length $f$ produces a real image $n$ times the size of the object. The distance of the object from the lens is:

1 Mark(s)

Your Answer:

$(n+1)f/n$ $(n+1)f/n$
$(n-1)f/n$ $(n-1)f/n$
$(n+1)f$ $(n+1)f$
$nf$ $nf$

The tax on a commodity is diminished by 20% and its consumption increased by 15%. The effect on revenue is_________?

1 Mark(s)

Your Answer:

It increases by 8% It increases by 8%
It decreases by 8% It decreases by 8%
No change in revenue No change in revenue
It increases by 10% It increases by 10%
None None

The area of a square (in sq units) with side (a + 4) is

1 Mark(s)

Your Answer:

A) a 2 +8a + 8 A) a 2 +8a + 8
B) a 2 + 8a + 16 B) a 2 + 8a + 16
C) a 2 – 8a + 16 C) a 2 – 8a + 16
D) a 2 – 8a – 16 D) a 2 – 8a – 16

The OR operation can be represented as:

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Your Answer:

X = A + B X = A + B
X = A x B X = A x B
X = A - B X = A - B
X = A ⁄ B X = A ⁄ B

A sum of money doubles itself in \$5$ years at simple interest. In how many years will it become \$5$ times itself at the same rate?

1 Mark(s)

Your Answer:

15 years 15 years
20 years 20 years
25 years 25 years
30 years 30 years

In the structure of DNA, how many strands are twisted around each other?

1 Mark(s)

Your Answer:

one one
two two
three three
four four

A human hearing can not hear a sound of frequency more than:

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Your Answer:

10,000 Hz 10,000 Hz
20,000 Hz 20,000 Hz
5,000 Hz 5,000 Hz
15,000 Hz 15,000 Hz

It is also called the brain of the computer, as it translates instructions and performs calculations:

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Your Answer:

mouse mouse
Central processing unit(CPU) Central processing unit(CPU)
keyboard keyboard
monitor monitor

The sensitivity of a galvanometer is given by__________________?

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Your Answer:

C/BAN C/BAN
CAN/B CAN/B
BAN/C BAN/C
ABC/N ABC/N

The boiling point of kerosene is:

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Your Answer:

below 20 °C below 20 °C
35 °C to 70 °C 35 °C to 70 °C
70 °C to 120 °C 70 °C to 120 °C
170 °C to 250 °C 170 °C to 250 °C

The filter over which sewage is sprinkled is called as:?

1 Mark(s)

Your Answer:

Contact bed Contact bed
Percolating filter Percolating filter
Trickling filter Trickling filter
Intermittent sand filter Answer Intermittent sand filter Answer

Common ion effect is based on:

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Your Answer:

Mass action Mass action
Solubility product Solubility product
Le Chatelier Le Chatelier
Ionic product Ionic product

The Highest Common Factor of given numbers 72 and 56 is:

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Your Answer:

7 7
3 3
2 2
8 8

Which of the following best describes a mixture?

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Your Answer:

A) Chemically bonded atoms A) Chemically bonded atoms
B) Uniform composition always B) Uniform composition always
C) Substances physically combined C) Substances physically combined
D) Fixed formula D) Fixed formula

Hydrogen resembles with carbon because of having________________?

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Your Answer:

Same number of electrons in the valence shell
Similar physical state Similar physical state
Remarkable reducing properties Remarkable reducing properties
Homovalent (show same valency) Homovalent (show same valency)

A voltage V = V0 cos ωt is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?

1 Mark(s)

Your Answer:

V√/√2R V√/√2R
V/√2√R V/√2√R
V02/√2R V02/√2R
2/√2√R 2/√2√R

Which of the following is a disease in which excess of bile from the liver enters the blood and causes yellowness of skin and eyes?

1 Mark(s)

Your Answer:

cholera cholera
dysentery dysentery
jaundice jaundice
hepatitis hepatitis

Relative permeability $\mu_r$ for a superconductor is:

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Your Answer:

0 0
1 1
-1 -1
Infinite Infinite

The pH of water is:

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Your Answer:

8 8
3 3
2 2
7 7

In the transistor schematic symbol, the arrow______________?

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Your Answer:

is located on the emitter is located on the emitter
is located on the base is located on the base
is locate on the collector is locate on the collector
points form north to south points form north to south

Buna-S is:

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Your Answer:

Homopolymer Homopolymer
Condensation Condensation
Copolymer (butadiene-styrene) Copolymer (butadiene-styrene)
Natural polymer Natural polymer

Organic compounds are:

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Your Answer:

non-volatile non-volatile
volatile volatile
have high melting point have high melting point
have high boiling point have high boiling point

By solving the equation 5z + 8 = 18, the value of z will be:

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Your Answer:

5 5
6 6
2 2
4 4

A stream of high energy electrons is the:

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Your Answer:

alpha radiation alpha radiation
gamma radiation gamma radiation
beta radiations beta radiations
no radiations no radiations

The Roman numeral for 2367 is

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Your Answer:

A) MMCDLXVII A) MMCDLXVII
B) MMCCCXLVII B) MMCCCXLVII
C) MMCCCLXVII C) MMCCCLXVII
D) MMXCCLXVII D) MMXCCLXVII

Three flags each of different colours are available for a military exercise, Using these flags different codes can be generated by waving I. Single flag of different colours II. Any two flags in a different sequence of colours. III. three flags in a different sequence of colours. The maximum number of codes that can be generated is.

1 Mark(s)

Your Answer:

6 6
9 9
15 15
18 18

The number of discontinuous functions y(x) on [-2, 2] satisfying x 2 + y 2 = 4 is

1 Mark(s)

Your Answer:

A) 0 A) 0
B) 1 B) 1
C) 2 C) 2
D) >2 D) >2

A train \$200$ m long crosses a platform \$300$ m long in \$25$ seconds. Find the speed of the train in km/h.

1 Mark(s)

Your Answer:

72 km/h 72 km/h
68 km/h 68 km/h
75 km/h 75 km/h
80 km/h 80 km/h

Dielectric strength of air is approx:

1 Mark(s)

Your Answer:

$3 \times 10^6 V/m$ $3 \times 10^6 V/m$
$3 \times 10^8 V/m$ $3 \times 10^8 V/m$
$10^4 V/m$ $10^4 V/m$
$9.8 V/m$ $9.8 V/m$

Rectified spirit contains:

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Your Answer:

100% ethanol 100% ethanol
50% ethanol 50% ethanol
95% ethanol 95% ethanol
70% ethanol 70% ethanol

Find the cost of Rs. 6400, 10% stock at 15 discount.

1 Mark(s)

Your Answer:

5440 5440
5480 5480
6440 6440
6480 6480

The lens which causes incident parallel rays of light to diverge at a point is called:

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Your Answer:

convex lens convex lens
concave lens concave lens
counter lens counter lens
fiber lens fiber lens

In the following figure, the value of x+y is :

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Your Answer:

A) 90° A) 90°
B) 180° B) 180°
C) 100° C) 100°
D) 60° D) 60°

A retailer buys a sewing machine at a discount of 15% and sells it for Rs. 1955. Thus, he makes a profit of 15%. The discount is:

1 Mark(s)

Your Answer:

Rs. 270 Rs. 270
Rs. 290 Rs. 290
Rs. 300 Rs. 300
None of these None of these

A can do (1/3) of a work in 5 days and B can do (2/5) of the work in 10 days. In how many days both A and B together can do the work ?

1 Mark(s)

Your Answer:

75/8 days 75/8 days
44/6 days 44/6 days
48/5 days 48/5 days
None of these None of these

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JEE Main Mock Test 4 : Question 1 of 42