JEE Main Test 140

Result

JEE Main Test 140

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Weekly Quiz Competition

Question 1
4 / -1

The circles x² + y² + 6x + 6y = 0 and x² + y² - 12x - 12y = 0

A
cut orthogonally

B
touch each other internally

C
intersect two points

D
touch each other externally

Solution
Question 2
4 / -1

A
3 : 2

B
2 : 1

C
√2 : 1

D
4 : 1

Solution
Question 3
4 / -1

A
3y = ± 5

B
y = ± 5

C
3y = ± 25

D
y = ± 3

Solution
Question 4
4 / -1

A

B

C

D

Solution
Question 5
4 / -1

The entropy of a perfectly crystalline material is zero at 0°C. This is statement of

A
first law of thermodynamics

B
second law of thermodynamics

C
third law of thermodynamics

D
law of conservation of energy

Solution

Entropy is a measure of degree of disorder or randomness of the molecules of the system. It increases when temperature of the system increases.

According to third law of thermodynamics – entropy of all pure crystalline substance is taken as zero at absolute zero temperature.
Question 6
4 / -1

B(OH)₃ + NaOH ⇌ NaBO₂ + Na [B(OH)₄] + H₂O. How can this reaction is made to proceed in forward direction ?

A
Addition of cis-1, 2 -diol

B
Addition of borax

C
Addition of trans-1, 2 -diol

D
Addition of Na₂HPO₄

Solution

B(OH)₃ + NaOH ⇌ NaBO₂ + Na[B(OH)₄] + H₂O.

The given reaction is a reversible reaction. If some quantity of C is -1, 2-diol is added to the reaction mixture, reaction moves in forward direction.
Question 7
4 / -1

Name of following compound according to IUPAC nomenclature is

A
4–methoxy–2–nitrobenzaldehyde

B
4–formyl–3–nitroanisole

C
4–methoxy–6–nitrobenzaldehyde

D
2–formyl–5–methylnitrobenzene

Solution

Aldehyde has more priority than nitro and alkoxy groups. So, IUPAC name is 4 – methoxy – 2 – Nitrobenzaldehyde.
Question 8
4 / -1

Which of the following mentioned is a type of hydrocarbon?

A
Saturated hydrocarbon

B
Unsaturated hydrocarbon

C
Aromatic hydrocarbon

D
All of the above

Solution

A copound of carbon and hydrogen only is known as hydrocarbon. There are three types of hydrocarbon – saturated, unsaturated an anomatic
Question 9
4 / -1

Which kind of defect is shown by the given crystal?

A
Schottky defect

B
Frenkel defect

C
Schottky and Frenkel defects

D
Substitution disorder

Solution

A schottky defect is a type of point defect in a crystal lattice. In non – ionic crystals it means a lattice vacancy defect.

In ionic crystals, the defect forms when oppositely charged ions leave their sites, creating vacancies. There vacancies are formed in stoichiometric units, to maintains an overall neutral change in the ionic solid. The vacancies are then free to move about their own entities. Normally these defects will lead to a decrease in the density of the crystal.
Question 10
4 / -1

Naphthalene can be easily purified by

A
sublimation

B
crystallisation

C
distillation

D
vaporisation

Solution

Napthalene is purified by one process of sublimotion because nepthalene sublimes on heating substances which sublimes on heating are usually purified by the process of sublimation.