JEE Main Test 69

Result

JEE Main Test 69

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Weekly Quiz Competition

Question 1
4 / -1

A
0.46 rad m^-1

B
3 rad m^-1

C
1.66 rad m^-1

D
0.83 rad m^-1

Solution
Question 2
4 / -1

The ratio of masses of oxygen and nitrogen of a particular gaseous mixture is 1 : 4. The ratio is number of their molecule is

A
1 : 4

B
7 : 32

C
1 : 8

D
3: 16

Solution
Question 3
4 / -1

Which of the following is absorbed by the ozone layer?

A
γ – rays

B
Visible light

C
Radio waves

D
Ultraviolet rays

Solution

The ozone layer shield refers to region of earth stratosphere that absorb most of the sun Ultraviolet(UV) radiation. It contain high concentration of Ozone(O₃) relative to other parts of the atmosphere.
Question 4
4 / -1

If (x, y) are any point on the parabola y² = 4x. Let P be the point that divides the line segment from (0, 0) to (x, y) in the ratio 1 : 3. Then, the locus of P is

A
x² = y

B
y² = 2xy

C
y² = x

D
x² = 2y

Solution
Question 5
4 / -1

100π phase difference = ... path difference.

A
10λ

B
25λ

C
50λ

D
100λ

Solution
Question 6
4 / -1

An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If T_i is the initial temperature and T_f is the final temperature, which of the following statements is correct ?

A
( T_f )_irrev > ( T_f )_rev

B
T_f > T_i for reversible process but T_f = T_i for irreversible process

C
( T_f )_rev = ( T_f )_irrev

D
T_f > T_i for both reversible and irreversible process

Solution

Work done in reversible process is maximum .Thus (T_f) _irreversible > (T_f) _reversible
Question 7
4 / -1

The two parabolas x² = 4y and y² = 4x meet in two distinct points. One of these is the origin and the other is

A
(2, 2)

B
(4, -4)

C
(4, 4)

D
(-2, 2)

Solution

Given two parabolas x² = 4y and y² = 4x meet in two distinct points one of these is origin.
Question 8
4 / -1

Two polaroids are placed in the path of unpolarised beam of intensity /0 such that no light is emitted from the second polaroid. If a third polaroid whose polarisation axis makes an angle 0 with the polarisation axis of first polaroid, is placed between these polaroids, then the intensity of light emerging from the last polaroid will be

A

B

C

D

Solution
Question 9
4 / -1

For the reaction SO₂ (g) + 1/2 O₂ (g) ⇌ SO₃ (g)
if, K_p = K_c (RT)^x
where, the symbols have usual meaning, then the value of x is (assuming ideality)

A
- 1

B
- (1/2)

C
1/2

D
1

Solution
Question 10
4 / -1

CO₂ goes to air, causes green house effect and gets dissolved in water. What will be its effect on soil fertility and pH of the water?

A
Increase

B
Decrease

C
Remain same

D
None of these

Solution

When carbon dioxide in the air dissolves in water in the atmosphere the process is called carbonation. When this carbonic acid (H₂CO₃) gets into soil, this contribute to increase in acidity in soil. There by pH of the soil decreases and also fertility of the soil also decreases.