NEET Test 202

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NEET Test 202

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Weekly Quiz Competition

Question 1
4 / -1

Five moles of an ideal gas at 1 bar and 298 K is expanded into vacuum to double the volume. The work done is:

A

B

C

D
zero

Solution
Question 2
4 / -1

A bar magnet is dropped between a current carrying coil. What would be its acceleration?

A
g downwards

B
Greater than g downwards

C
Less than g downwards

D
Bar will be stationary

Solution

So, due to change in the flux emf is induced in the coil and by Lenz's law current flow in the direction which opposes the change in a magnetic field. So, the force due to this current-induced magnetic field opposes the motion of the bar magnet. Therefore, the net acceleration of fall is less than g.
Question 3
4 / -1

A person can see clearly only upto a distance of 25 cm. He wants to read a book placed at a distance of 50 cm from his eyes. What is the power of the lens of his spectacles?

A
−1.0D

B
−1.33D

C
−1.67D

D
−2D

Solution

For correcting myopia, a concave lens is used and for the lens.
Question 4
4 / -1

If electric power from 100MW power station is transmitted to a substation at 20,000V, the power loss during transmission is P₁. If the same power is transmitted at 200V, the power loss is P₂. The ratio will be-

A
10⁴

B
10³

C
10²

D
10

Solution
Question 5
4 / -1

In a thermodynamic process, 200 J of heat is given to gas and 100 J of work is also done on it. The change in internal energy of the gas is:

A
100 J

B
500 J

C
600 J

D
700 J

Solution

According to the First law of thermodynamics, the total heat interaction of the system is equal to the sum of total work done by the system and the change in internal energy.

ΔU=Q−W

Q=200 J

W=100 J

∴ ΔU=(200−100) J=100 J
Question 6
4 / -1

Which of the following is an incorrect statement with respect to S_N1 and S_N2 mechanisms for alkyl halides?

A
A strong nucleophile in a polar aprotic solvent increases the rate of S_N2 reaction.

B
S_N1 reactions can be catalysed by some Lewis acids (e.g., Ag⁺ or AlCl₃).

C
S_N2 reactions can be catalysed by Lewis acids through the formation of a carbocation intermediate.

D
A weak nucleophile and a polar protic solvent favour the S_N1 reaction mechanism.

Solution

• Statement (C) is INCORRECT (Hence, the correct answer):
Lewis acids (like Ag+ or AlCl₃) assist in removing the halide ion to form a stable carbocation intermediate. Since carbocation formation is the rate-determining step for the S_N1 mechanism, Lewis acids catalyse S_N1 reactions, not S_N2 reactions. S_N2 reactions proceed via a single-step concerted mechanism with a transition state, without forming any carbocation intermediate.

• Statement (A) is CORRECT: Strong nucleophiles and polar aprotic solvents (like DMSO, Acetone) accelerate S_N2 reactions because the solvent does not solvate the nucleophile strongly, keeping it highly reactive.

• Statement (B) is CORRECT: Lewis acids bind to the leaving group (halide) and help it depart, accelerating the formation of carbocations in S_N1 reactions.

• Statement (D) is CORRECT: Polar protic solvents (like H₂O, EtOH) stabilize the carbocation intermediate via solvation, and weak nucleophiles prevent competing bimolecular (S_N2) pathways, thereby favouring the S_N1 reaction.
Question 7
4 / -1

Read the following statement and find out the incorrect statement:

A
The altered understanding of the plant kingdom describes that Fungi and members of the Monera and Protista having cell walls have now been excluded from Plantae

B
Cyanobacteria that are also referred to as blue-green algae are not 'algae' any more

C
Numerical taxonomy is based on chromosome number structure and behavior

D
Chemotaxonomy that uses the chemical constituents of the plant to resolve confusions are also used by taxonomists these days

Solution

The branch of science that deals with the naming and classification of living organisms on the basis of similarities and dissimilarities. is called taxonomy. Numerical taxonomy based on old observable characteristics. It is done by using computers. Numbers and codes are assigned to those characteristics and then processing starts. In chemotaxonomy, classification is done on the basis of chemicals that organisms possess. In cytotaxonomy, the classification of living organisms is done on the basis of their cellular structure especially chromosome number, meiotic behavior, and its structure.
Question 8
4 / -1

Which one of the following pairs is wrongly matched?

A
Nitrosomonas: Nitrifying and chemo lithotrophic bacteria.

B
Rhodospirillum: Nitrogen fixation bacteria and Photo-organotrophs bacteria.

C
E.coli: used in genetic engineering and pollution indicating bacteria.

D
Pseudomonas: responsible for food poisoning and purity of Ganga water.

Solution

Pseudomonas are responsible for removing oil contamination. They act as bioremediation organisms. These organisms enhance plant growth promotion and reduce the severity of various diseases.
Question 9
4 / -1

In which part of the body is blood produced?

A
Lungs

B
Heart

C
Brain

D
Bone Marrow

Solution

Blood produced in Bone Marrow.

The bone marrow is the soft, spongy material in the centre of the bones. It produces about 95% of the body's blood cells. Most of the adult body's bone marrow is in the pelvic bones, breast bone, and the bones of the spine.
Question 10
4 / -1

Which of the following national parks is home to the Asiatic lion?

A
Ranthambore National Park

B
Keoladeo National Park

C
Kaziranga National Park

D
Gir National Park

Solution

Gir National Park, The only place to see Asiatic Lions in the world. The Gir Forest National Park and Wildlife Sanctuary is a forest zone located 43 km north-east of Somnath.