JEE Main Mock Test 7 - Online MCQ Exam

If x ∝ y² then:

1 Mark(s)

Your Answer:

x = y² x = y²
x = ky² x = ky²
xy² = 1 xy² = 1
xy² = k xy² = k

A lorry covers a distance of 100 km in 2 hours 30 minutes. A car runs with a speed of 55 km/hour. Determine the ratio of their speeds.

1 Mark(s)

Your Answer:

8:11 8:11
20:11 20:11
4:11 4:11
None of These None of These

Total number of possible matrices of order 3 × 3 with each entry 2 or 0 is

1 Mark(s)

Your Answer:

A) 9 A) 9
B) 27 B) 27
C) 81 C) 81
D) 512 D) 512

8 2/3 + 6 4/5 = _____?

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Your Answer:

14 14
14 1/2 14 1/2
14 3/4 14 3/4
None of these None of these

What is the color of Phenolphthalein in acidic solution?

1 Mark(s)

Your Answer:

red red
yellow yellow
blue blue
colorless colorless

If $x = a e^{-\alpha t} + b e^{\beta t}$, the velocity:

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Your Answer:

Drops to zero Drops to zero
Increases with time Increases with time
Decreases with time Decreases with time
Is constant Is constant

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

Weathering of rocks is an example of ___________

1 Mark(s)

Your Answer:

A) Both physical and chemical changes A) Both physical and chemical changes
B) Physical change B) Physical change
C) Chemical change C) Chemical change
D) None of these D) None of these

Bromine is a non-metal in:

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Your Answer:

solid state solid state
liquid state liquid state
gaseous state gaseous state
plasma state plasma state

In chemical equation H 2 (g) + I 2 (g) $\rightleftharpoons$ 2HI (g) the equilibrium constant K p depends on

1 Mark(s)

Your Answer:

A) total pressure A) total pressure
B) catalyst used B) catalyst used
C) amount of H 2 and I 2 C) amount of H 2 and I 2
D) temperature D) temperature

An organic compound contains carbon , hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be

1 Mark(s)

Your Answer:

A) CHO A) CHO
B) CH 4 O B) CH 4 O
C) CH 3 O C) CH 3 O
D) CH 2 O D) CH 2 O

If the temperature of a black body is doubled, the energy radiated per second becomes:

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Your Answer:

2 times 2 times
4 times 4 times
8 times 8 times
16 times 16 times

The rising currents of hot air are called:

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Your Answer:

air currents air currents
thermals thermals
radiation radiation
layers layers

The material known in commerce as Terylene is a:?

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Your Answer:

Natural fibre Natural fibre
Synthetic fibre Synthetic fibre
Blend of cotton and Silk Blend of cotton and Silk
Modified natural fibre Answer Modified natural fibre Answer

The only non metal exists in liquid state is ___________?

1 Mark(s)

Your Answer:

Mercury Mercury
Bromine Bromine
Phosphorus Phosphorus
Iodine Iodine

Ore of chromium is called:

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Your Answer:

galena galena
zinc blende zinc blende
cinnabar cinnabar
chromite chromite

If the temperature of air increases by $1^\circ C$, the speed of sound increases by approx:

1 Mark(s)

Your Answer:

$0.61 m/s$ $0.61 m/s$
$1 m/s$ $1 m/s$
$2 m/s$ $2 m/s$
$330 m/s$ $330 m/s$

The area of a rectangle with length \$45$ cm and width \$10$ cm is:

1 Mark(s)

Your Answer:

430 cm² 430 cm²
440 cm² 440 cm²
450 cm² 450 cm²
460 cm² 460 cm²

Which of the following are high molecular weight polymers?

1 Mark(s)

Your Answer:

carbohydrates carbohydrates
hydrocarbons hydrocarbons
proteins proteins
lipids lipids

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved? (i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction

1 Mark(s)

Your Answer:

A) (i) only A) (i) only
B) (ii) only B) (ii) only
C) (iv) only C) (iv) only
D) (ii) and (iv) D) (ii) and (iv)

Magnesium metal does not burn in the vessel containing_______________?

1 Mark(s)

Your Answer:

N2 N2
O2 O2
N2 and O2 N2 and O2
Ne Ne

Lindlar's catalyst is used for:

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Your Answer:

Complete reduction Complete reduction
No reduction No reduction
Partial reduction to cis-alkene Partial reduction to cis-alkene
Oxidation Oxidation

What is the outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s ?

1 Mark(s)

Your Answer:

1N 1N
10N 10N
2N 2N
100N 100N

What is the chemical name of Marsh gas?

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Your Answer:

Deuterium Oxide (D 2 O) Deuterium Oxide (D 2 O)
Sucrose (C 12 H 22 O 11 ) Sucrose (C 12 H 22 O 11 )
Methane (CH₄) Methane (CH₄)
Nitrous Oxide (N 2 O) Answer Nitrous Oxide (N 2 O) Answer

Which one of following band is completely filled in case of conductors ?

1 Mark(s)

Your Answer:

Conduction band Conduction band
Fermi band Fermi band
Valence band Valence band
Forbidden band Forbidden band

By solving the equation a = 2 - 9a, the value of a will be:

1 Mark(s)

Your Answer:

1⁄5 1⁄5
2⁄3 2⁄3
2⁄5 2⁄5
1⁄2 1⁄2

If a man walks at 6 kmph, he can reach his destination at 9:00 am. However, he walks a little slower and reaches only at 10:00 am. If the distance to his destination was 12 km, at what speed did he walk?

1 Mark(s)

Your Answer:

5 kmph 5 kmph
4 kmph 4 kmph
4.5 kmph 4.5 kmph
3 kmph 3 kmph

A satellite is launched into a circular orbit of radius $R$ around the earth. A second satellite is launched into an orbit of radius $1.01R$. The period of the second satellite is larger by approximately:

1 Mark(s)

Your Answer:

0.01 0.01
0.03 0.03
0.015 0.015
0.005 0.005

The area of a rectangle with length \$35$ cm and width \$7$ cm is:

1 Mark(s)

Your Answer:

230 cm² 230 cm²
240 cm² 240 cm²
245 cm² 245 cm²
250 cm² 250 cm²

The sum of 13.87 and 2.005 is

1 Mark(s)

Your Answer:

A) 15.875 A) 15.875
B) 1.5875 B) 1.5875
C) 158.75 C) 158.75
D) 0.15875 875 D) 0.15875 875

In the ordered pair (-2, -3), the abscissa is:

1 Mark(s)

Your Answer:

3 3
−2 −2
2 2
−3 −3

Supersaturated solution is:

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Your Answer:

Normal saturation Normal saturation
More than saturated More than saturated
Less than saturated Less than saturated
No solute No solute

Which allotropic form of phosphorous is the most stable ?

1 Mark(s)

Your Answer:

White White
black black
red red
Violet Violet

The rectangular plate has length $L$ and width $W$. If coefficient of linear expansion is $\alpha$, the coefficient of areal expansion is:

1 Mark(s)

Your Answer:

$\alpha$ $\alpha$
$2\alpha$ $2\alpha$
$3\alpha$ $3\alpha$
$\alpha^2$ $\alpha^2$

To deflect electrons to desired positions on the screen of a television tube, we use:

1 Mark(s)

Your Answer:

circuit breaker circuit breaker
electric current electric current
electromagnets electromagnets
fuse fuse

The capacitor which has a dielectric between its plates and is made of a flexible material that can be rolled into the shape of a cylinder is called:

1 Mark(s)

Your Answer:

ceramic capacitors ceramic capacitors
fixed capacitors fixed capacitors
parallel plate capacitors parallel plate capacitors
electrolytic capacitors electrolytic capacitors

Lucas test is used to distinguish:

1 Mark(s)

Your Answer:

Aldehydes Aldehydes
Ketones Ketones
Alcohols Alcohols
Ethers Ethers

A cistern has a leak which can empty it in \$12$ hours. A tap is opened which fills at \$10$ liters per hour and the cistern is now emptied in \$20$ hours. Find the capacity of the cistern.

1 Mark(s)

Your Answer:

250 liters 250 liters
300 liters 300 liters
350 liters 350 liters
400 liters 400 liters

Assertion (A): Infrared thermometers were widely used during the COVID-19 pandemic. Reason (R): Infrared thermometers can measure temperature without direct contact with the body.

1 Mark(s)

Your Answer:

A) Both A and R are true and R is correct explanation of the assertion,
B) Both A and R are true but R is not the correct explanation of the assertion,
C) A is true but R is false, C) A is true but R is false,
D) A is false but R is true Match the following items given in Column A with that in Column B:

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

Amylose and amylopectin differ in:

1 Mark(s)

Your Answer:

Monomer Monomer
Branching Branching
Ring size Ring size
Polarity Polarity

Find the greatest 4-digit number exactly divisible by 3, 4 and 5?

1 Mark(s)

Your Answer:

9985 9985
9960 9960
9957 9957
9975 9975

Evaluating Your Answers

JEE Main Mock Test 7 : Question 1 of 42