NEET Test 88

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NEET Test 88

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Weekly Quiz Competition

Question 1
4 / -1

During detection of nitrogen in Lassaigne's test, instead of deep blue colouration, sometimes a blood red colouration is observed. Which of the following statements is true?

A
Nitrogen is not present in the sample

B
Sulphur is not present in the sample

C
Neither nitrogen nor sulphur is present in the sample

D
Both nitrogen and sulphur are present in the sample

Solution

Chemistry for test for nitrogen:

Sodium fusion extract is boiled with ferrous sulphate and acidified with sulphuric acid. Sodium cyanide reacts with ferrous sulphate and forms sodium hexacyanoferrate(II) Fe4FeCN63.

On heating with sulphuric acid, some ferrous is oxidized to ferric hexacyanoferrate which is Prussian blue in colour.

Chemistry of the test for sulphur:

Acetic acid is added to sodium fusion extract. complete precipitation of sulphur in the form of lead sulphate occurs which is black in colour. Also, the sodium fusion extract is treated with sodium nitroprusside to obtain violet color. However, if N and S are present, then instead of NaCN, NaSCN is obtained. This gives blood-red colour on reaction with Fe3+ ions.

Hence, the correct option is (D).
Question 2
4 / -1

An AC series circuit contains a 4Ω resistance and a 3Ω inductive reactance. What is the impedance of the circuit?

A
1Ω

B
5Ω

C
7Ω

D
7/√2 Ω

Solution
Question 3
4 / -1

Which of the following options is wrong?

A
Pollen grains remain viable for several months because their outer covering is made of sporopollenin. The exine is composed of sporopollenin, which is derived from carotenoids by oxidative polymerization.

B
No enzyme can degrade sporopollenin.

C
Pollen grains are well represented in fossil strata due to sporopollenin.

D
Pollen wall has cavities containing proteins.

Solution

Pollen wall comprises two principal layers, the inner intine, and outer exine. The intine is pectocellulosic in nature. A special feature of intine is the presence of beads, ribbons, or plates of enzymatic proteins particularly in the vicinity of germ pores. The exine is composed of sporopollenin which is derived from carotenoids by oxidative polymerization. it is resistant to physical and biological decomposition. Due to this, pollen walls are often preserved for long periods in fossil deposits.

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

The radius of the moon is 1.7×10⁶ m and its mass is 7.35 ×10²² kg. What is the acceleration due to gravity on the surface of the moon?

Given,

G = 6.67 × 10^-11N m² kg ^-2

A
1.696 ms^-2

B
1.698 ms^-2

C
1.690 ms^-2

D
1.695 ms^-2

Solution
Question 5
4 / -1

Which of the following is not isostructural with SiCl₄?

A

B

C
SCI₄

D

Solution

SCl₄ is not isostructural with SiCl₄because shows square planar structure due to involvement of repulsion between lone pair and bond pair of electrons.

Hence, the correct option is (C).
Question 6
4 / -1

Which of the following statement is correct?

A
When Z >1, real gases are difficult to compress

B
When Z =1, real gases are easy to compress

C
When Z = 1, real gases are easily compressed

D
When Z >1, real gases are easier to compress

Solution

Deviations from the ideal behavior can be measured by the compressive factor Z, which is the ratio of the product of PV and nRT.

Mathematically:

Z = pV / nRT

When Z > 1, repulsive forces are dominant hence, the real gases will be difficult to be compressed.

Hence, the correct option is (A).
Question 7
4 / -1

In which of the following compounds there is more than one kind of hybridization (sp,sp²,sp³) for carbon?

A

B

C

D

Solution
Question 8
4 / -1

The function of which of the following nerves is to connect the muscles and skin to the spinal cord?

a. The cranial nerves

b. The spinal nerves

c. The visceral nerves

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

The spinal cord ends near the first lumbar vertebra (L1). From that point, the nerves resemble the tail of a horse and are therefore called the cauda equina. Ligaments connect bone to bone and Tendons attach muscle to bone.

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

Birth control pills check ovulation in female by inhibiting the secretion of:

A
Follicle stimulating hormone (FSH)

B
Luteinizing hormone (LH)

C
Both (A) and (B)

D
None of the above

Solution

The levels of estrogen and the progesterone hormone rise, which in turn inhibit the secretion of Follicle stimulating hormone (FSH) and Luteinizing hormone (LH). The birth control pill contains hormones that work with the body's natural hormones to prevent pregnancy by putting a stop to ovulation.

Hence, the correct option is (C).
Question 10
4 / -1

A simple pendulum of length l has a brass bob attached at its lower end. Its period is T. If a steel bob of same size, having density x times that of brass, replaces the brass bob and its length is changed so that period becomes 2T, then new length is

A
2 l

B
4 l

C
4 x

D
4l / x

Solution

Time period depends only on effective length. Density has no effect on time period. If length made 4 times then time period becomes 2 times.

Hence, the correct option is (B).