NEET Test 87

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NEET Test 87

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Weekly Quiz Competition

Question 1
4 / -1

Water shows anomalous behavior between:

A
0 to 4°C

B
0 to 5°C

C
0 to -4°C

D
4 to 0°C

Solution

The water shows a wide range of anomalies compared to similar liquids or hydrides of another group of 16 elements. One of the most talked-about anomalies is the formation of ice from liquid water and how the density changes when we cool the water.

When we cool water from a higher temperature, the density steadily decreases. At 4^oC it is the highest. But below 4^oC, The H-bonds break between the molecules, and the molecules get drifted further apart the volume increases, and density decreases. The crystalline form of water is ice. At atmospheric pressure, ice crystallizes in the hexagonal form, but at very low temperatures it condenses to cubic form leaving a gap between the structures, thus increasing the volume again.

The density of ice is less than that of water. Therefore, an ice cube floats on water. In the winter season ice formed on the surface of a lake provides thermal insulation which ensures the survival of the aquatic life.

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

The transverse displacement of a string fixed at both ends is given by

x and y are in metres and t is in seconds. The length of the string is 1.5m and its mass is 3.0×10⁻² kg. What is the tension in the string?

A
648 N

B
724 N

C
832 N

D
980 N

Solution
Question 3
4 / -1

Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?

A
A coenzyme

B
A hormone

C
An enzyme

D
An antibiotic

Solution

A chemical substance produced in the body that controls and regulates the activity of certain cells or organs is called hormone. Insulin is a hormone secreted by the pancreas and controls the metabolism of glucose and maintains glucose level in the blood. Insulin is a peptide hormone produced by β - cells of the pancreatic islets. It allows human body to use glucose for energy. Glucose is a type of sugar found in many carbohydrates and which is responsible for the level of diabetes.

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

The precipitate of CaF₂( K_sp=1.7×10⁻¹⁰) is obtained by mixing equal volumes of:

A

B

C

D

Solution

The precipitate will form only

When,

lonic product > Solubility product

So, precipitate will form.

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

Which of the following statements is not correct?

A
In man, insulin is synthesised as a proinsulin

B
The proinsulin has an extra peptide called C-peptide

C
The functional insulin has A and B chains linked together by hydrogen bonds

D
Genetically engineered insulin is produced in E-Coli
Question 6
4 / -1

The rate constant for a first-order reaction is 4.606×10⁻³s⁻¹. The time required to reduce 2.0 g of the reactant to 0.2 g is

A
100 s

B
200 s

C
500 s

D
1000 s
Question 7
4 / -1

Two vibrating strings of the same material, but lengths L and 2 L have radii 2 r and r, respectively. They are stretched under the same tension. Both the strings vibrate in their fundamental modes, the one of length L with frequency v1 and the other with frequency v₂. The ratio v₁/v₂ is

A
2

B
4

C
8

D
1

Solution
Question 8
4 / -1

In genetic code dictionary, codons used to code for all the 20 essential amino acids are ____ in number.

A
29

B
60

C
64

D
61

Solution

In genetic code dictionary, codons used to code for all the 20 essential amino acids are 61 in number.

The genetic codon is triplet and at each position of the triplet there are four possibilities due to presence of four nucleotides in nucleic acids, thereby meaning there are (4 x 4 x 4) or 64 possible codons. Out of these 64 possible codons, three codons UAA, UAG, UGA are termination codons. They do not code for any amino acids but result in termination of protein chain. Thus, 61 codons code for 20 essential amino acids.

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

Analyze the picture given below and fill the labeling (a), (b) and (c).

A
(a) Thinking, memory, behaviour, movement, sight (b) Maintenance of body temperature (c) Breathing, heart rate

B
(a) Breathing, heart rate, temperature (b) Sight (c) Thinking, memory, behavior, movement

C
(a) Thinking, memory, behaviour, movement (b) Sight (c) Breathing, heart rate, temperature

D
(a) Breathing, heart rate, thinking memory, behaviour, movement (b) Maintenance of body temperature (c) Sight

Solution

The frontal lobe of the cerebrum controls all the voluntary activities of the body. It is the seat of memory, will, intelligence, reasoning, learning, behavior and movement. The temporal lobe is responsible for sight and the brain stem controls the breathing and respiration, regulates the heartbeat and maintains the temperature.

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

Consider an n−p−n transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current?

A
1.1 mA

B
1.01 mA

C
10 mA

D
0.01 mA

Solution