NEET Test 201

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NEET Test 201

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Weekly Quiz Competition

Question 1
4 / -1

An infinite line charge produces a field of 9 × 10⁴N/C at distance of 2 cm. Calculate the linear charge density.

A
12μC/m

B
10μC/m

C
11μC/m

D
9μC/m

Solution
Question 2
4 / -1

Electric charge q is uniformly distributed over a rod of length l. The rod is placed parallel to a long wire carrying a current i. The separation between the rod and the wire is a. Find the force needed to move the rod along its length with a uniform velocity v.

A

B

C

D

Solution

The force needed to move the rod along its length with a uniform velocity,
Question 3
4 / -1

The motor of an electric train can give it an acceleration of 1 m/s² and its brakes can give it a negative acceleration of 3 m/s². The shortest time in which the train can make a trip between two stations 1350 m apart is

A
14.5 s

B
28.4 s

C
60 s

D
113.6 s

Solution
Question 4
4 / -1

A greenish yellow gas is obtained by heating potassium dichromate with conc. hydrochloric acid. Which of the following options is wrong about the gas liberated here?

A
It is chlorine gas.

B
This gas turns blue litmus paper red and then bleaches it.

C
It is a strong bleaching agent.

D
It turns moist starch iodide paper blue black.

Solution

To test for chlorine, use damp blue litmus paper. The blue colour will turn red and then to white. Chlorine gas reacts with water to produce an acidic solution which is also an effective bleach. This explains how the test for chlorine works. The acidic solution formed on the damp litmus paper turns the indicator red. Then the bleach turns the red colour to white.
Question 5
4 / -1

"Molecular scissors" used in genetic engineering is:

A
Helicase

B
DNA ligase

C
DNA polymerase

D
Restriction endonuclease

Solution

Restriction endonuclease enzyme is known as the "molecular scissor" because a restriction enzyme recognizes and cuts the DNA only at a particular sequence of nucleotides and producing smaller fragments.

Helicases are enzymes that bind and may even remodel nucleic acid or nucleic acid-protein complexes. There are DNA and RNA helicases which are involved in the unwinding of the nucleic acids.

In molecular biology, DNA ligase is a specific type of enzyme that facilitates the joining of DNA strands together by catalyzing the formation of a phosphodiester bond.

The DNA polymerases are enzymes that create DNA molecules by assembling nucleotides, the building blocks of DNA.
Question 6
4 / -1

The difference between electron gain enthalpies will be maximum between:

A
Ne and F

B
Ne and Cl

C
Ar and Cl

D
Ar and F

Solution

Cl has the most negative ΔH_eg among all the elements and Ne has the most positive ΔH_eg
Question 7
4 / -1

A solenoid of inductance L and resistance R is connected to a battery. The time taken for the magnetic energy to reach 1/4 of its maximum value is:

A

B

C

D

Solution
Question 8
4 / -1

A stone dropped from the top of a tower reaches ground in 4 s. Height of the tower is (g = 10 m/s²)

A
20 m

B
40 m

C
80 m

D
160 m

Solution
Question 9
4 / -1

Electrical conductivity of a semiconductor increases when em radiation of λ < 2480 nm is incident on it. The band gap in (ev) for the semiconductor is

A
1.1eV

B
2.5eV

C
0.7eV

D
0.5eV

Solution
Question 10
4 / -1

The compound, which has one isopropyl group is :

A
2,2,3,3-tetramethylpentane

B
2,2-dimethylpentane

C
2,2,3-trimethylpentane

D
2-methylpentane

Solution