JEE Main Test 123

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JEE Main Test 123

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Weekly Quiz Competition

Question 1
4 / -1

Light of wavelength 6000 Å falls on a single slit of width 0.1 mm. The second minimum will be formed for the angle of diffraction of

A
0.08 rad

B
0.06 rad

C
0.12 rad

D
0.012 rad

Solution
Question 2
4 / -1

On introducing a thin film in the path of one of the two interfering beams, the central fringe will shift by one fringe width. If μ =1.5, the thickness of the film is (wavelength of monochromatic light is λ)

A
4λ

B
3λ

C
2λ

D
λ

Solution
Question 3
4 / -1

A parabola is drawn with its focus at (3, 4) and vertex at the focus of the parabola y² - 12x - 4y + 4 = 0. The equation of the parabola is

A
y² - 8x - 6y + 25 = 0

B
y² - 6x + 8y - 25 = 0

C
x² - 6x - 8y + 25 = 0

D
x² + 6x - 8y - 25 = 0
Question 4
4 / -1

A
n

B
n²

C
n³

D
None of these
Question 5
4 / -1

Directions For Questions

For an ideal gas, consider only p-V work in going from an initial state X to the final state Z. The final state Z can be reached by either of the two paths shown in the figure.

...view full instructions

Which of the following choice (s) is (are) correct ?

A
∆S_X→Z = ∆S_X→Y + ∆S_Y→Z

B
W_X→Z = W_X→Y + W_Y→Z

C
W_X→Y→Z = W_X→Y

D
∆S_X→Y→Z = ∆S_X→Y

Solution

Since entropy is a property, the change in entropy of the system over one complete cycle is zero. Because when a system is carried through a cyclic process leaves yhe system in the same state in which it started.
Question 6
4 / -1

The thermal dissociation of equilibrium of CaCO₃ (S) is studied under different conditions.

CaCO₃ (s) ⇌ CaO (s) + CO₂ (g)

For this equilibrium, the correct statement (s) is (are)

A
∆H is dependent on T

B
K is not independent of the initial amount of CaCO₃

C
K is dependent on the pressure of CO₂ at given T

D
∆H is independent of the catalyst, if any

Solution

Calcium carbonate releases carbon dioxide on heating called a thermal decomposition reaction or calcination(to above 840^oC) to form calcium oxide, commonly called quick lime, with reaction enthalpy 178KJ mol^–1.
Question 7
4 / -1

The mass of carbon anode consumed (giving only carbon dioxide) in production of 270 kg of aluminium metal from bauxite by the Hall process is

(Atomic mass of Al = 27)

A
180 kg

B
270 kg

C
540 kg

D
90 kg

Solution

Bauxite is not directly used in Hall’s process. It is first converted into alumina by bayer’s process. Reaction of carbon with Al₂O₃ forming Aluminium and carbon dioxide is given.
Question 8
4 / -1

The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

A

B

C

D

Solution
Question 9
4 / -1

The epoxide ring consists of which of the following?

A
Three membered ring with two carbon and one oxygen

B
Four membered ring with three carbon and one oxygen

C
Five membered ring with four carbon and one oxygen

D
Six membered ring with five carbon and one oxygen

Solution

Epoxide consists of three membered ring with two carbon and one oxygen.
Question 10
4 / -1

Silver (atomic weight = 108 g mol^-1 ) has a density of 10.5 g cm^-3. The number of silver atoms on a surface of area 10^-12 m² can be expressed in scientific notation as y × 10^x . The value of x is

A
3

B
5

C
7

D
9

Solution