NEET Test 125

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NEET Test 125

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Weekly Quiz Competition

Question 1
4 / -1

Consider the reaction N₂+ 3H₂→ 2NH₃ carried out at constant temperature and pressure. If ΔH and ΔE are the enthalpy and internal energy changes for the reaction, which of the following expression is true?

A
ΔH = 0

B
ΔH = ΔE

C
ΔH < ΔE

D
ΔH > ΔE

Solution
Question 2
4 / -1

In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to

A
Lower the melting point of bauxite

B
Dissolve bauxite and render it a conductor of electricity

C
Protect aluminium produced from oxygen

D
Minimise the heat loss due to radiation

Solution

In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge because it reduces the melting point of Bauxite (from 1200^oC to 800^o−900^oC) and also it increases the electrical conductivity of the mixture.

Hence the correct option is (B).
Question 3
4 / -1

By which of the following reagents, butanoic acid can be converted into butane?

A
Red P / HI

B
NaOH / CaO

C
CH₃M_gBr

D
All of these

Solution

Butanoic acid can be converted to butane by heating with hydriodic acid (HI) and red phosphorus (Red P).

Hence, the correct option is (A)
Question 4
4 / -1

The X- coordinates of the particles of a system of bodies whose centre of mass is at origin will be?

A
Always positive for all particles

B
Always negative for all the particles

C
Positive for some particles and negative for other particles

D
None of these

Solution

If the centre of mass is at the origin, this means that some particles will be towards the left of the centre of mass and some towards the right of the centre of mass.

The particles towards the left of centre of mass will have a negative value of X-coordinate whereas those towards the right will have a positive value of X-coordinate.

In this case, the particles can not have always positive values of X-coordinates or always negative values of X-coordinates separately because the particles are uniformly distributed about the centre of mass of the body.

Hence, the correct option is (C).
Question 5
4 / -1

Figure shows three resistor configurations R₁,R₂ and R₃ connected to 3 V battery. If the power dissipated by the configuration R₁,R₂ and R₃ is P₁,P₂ and P₃ respectively then:

A

B

C

D

Solution
Question 6
4 / -1

A junction diode has a resistance of 25 when forward-biased and 2500 when reverse-biased. The current in the arrangement shown in the figure will be

A

B

C

D

Solution

The junction diode is forward biased.

Therefore, the effective resistance
Question 7
4 / -1

Which among the following is not an exact differential?

A
Q(dQ = heat absorbed)

B
U(dU = change in internal energy)

C
S(dS = entropy change)

D
G(dG = Gibbs free energy change)

Solution

Heat ′Q′ is a path-dependent function, hence its exact differentiation is not possible, however, internal energy, entropy, and Gibbs free energy are state functions, hence can be differentiated exactly.

Hence, the correct option is (A).
Question 8
4 / -1

A resonance air column of length 40 cm resonates with a tuning fork of frequency 450 Hz. Ignoring end corrections, the velocity of sound in air will be:

A
1020 m/s

B
920 m/s

C
820 m/s

D
720 m/s

Solution

We know that the minimum length of the air column tube corresponds to the fundamental mode of vibrations. Hence, by ignoring end corrections-

Length of column = 40 cm

= 0.4 m

Frequency of tuning fork = 450 m

Using the formula, n = v/4I

V = 450 × 4 × 0.4

=720 m/s

Hence,the correct option is (D).
Question 9
4 / -1

A rocket is fired from Earth to the Moon. The distance between Earth and the Moon is and the mass of Earth is 81 times the mass of the Moon. The gravitational force on the rocket will be zero when its distance from the Moon is:

A

B

C

D

Solution

The net force on the rocket is zero.

Because force due to the earth and force due to the moon is the same but in opposite direction.
Question 10
4 / -1

The displacement of electrons in multiple bonds in the presence of attacking reagent is called:

A
Inductive effect

B
Electromeric effect

C
Resonance

D
Hyper conjugation

Solution

The electromeric effect is a temporary effect brought into play at the requirement of attacking reagent. The electromeric effect refers to a molecular polarizability effect occurring by an intramolecular electron displacement. It is a temporary effect.

Hence, the correct option is (B).