JEE Main Test 73

Result

JEE Main Test 73

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Weekly Quiz Competition

Question 1
4 / -1

Blue colour of sea water is due to

A
interference of sunlight reflected from the water surface

B
scattering of sunlight by the water molecules

C
image of sky in water

D
refraction of sunlight

Solution

The blue hue of water is an intrinsic property and is caused by selective absorption and scattering of white light. Therefore, Scattering of sunlight by the water molecules.
Question 2
4 / -1

Let A(1, -1, 2) and B(2, 3, -1) be two points. If a point P divides AB internally in the ratio 2 : 3, then the position vector of P is

A

B

C

D

Solution
Question 3
4 / -1

A
0^o

B
60^o

C
30^o

D
90^o

Solution
Question 4
4 / -1

There are 7 horses in a race, Mr X selected 2 horses at random and bet on them. The probability that Mr X selected the winning horse is

A
1/7

B
4/7

C
3/7

D
2/7

Solution
Question 5
4 / -1

In the circuit shown assume the diode to be ideal. When V_i , increases from 2V to 6 V, the change in the current is (in mA)

A
zero

B
20

C
80/3

D
40

Solution
Question 6
4 / -1

A
1/72

B
3/73

C
5/72

D
1/74

Solution

∴Sum of probability distribution is 1

P(x) = p + 2p + 3p + 4p + 5p + 7p + 8p + 9p + 10p + 11p + 12p

72p = 1

p = 1/72
Question 7
4 / -1

A
5316 ReV

B
5422 ReV

C
5707 ReV

D
5818 ReV

Solution
Question 8
4 / -1

The most suitable reagent for the conversion of R— CH₂— OH → R — CHO is

A
KMnO₄

B
K₂ Cr₂ O₇

C
CrO₃

D
PCC (pyridinium chlorochromate)

Solution

The most suitable reagent for conversion of 1⁰ alcohol (R–CH₂–OH) to aldehyde (R–CHO) is Pcc (pyridinium chloro chromate). Because Pcc is highly specific and mild oxidising agent. It can oxidise primary alcohols to aldehyde but not to carboxylic acids. Where as other acids via aldehyde.
Question 9
4 / -1

Two protons are kept at a separation of 40Å. F_n is the nuclear force and F_e is the electrostatic force between them. Then,

A
F_n >> F_e

B
F_n = F_e

C
F_n << F_e

D
F_n ≈ F_e

Solution
Question 10
4 / -1

Two plates are 20 cm apart and the potential difference between them is 10V. The electric field between the plates is

A
50 Vm^-1

B
500 Vm^-1

C
0.5 Vm^-1

D
20 Vm^-1

Solution