NEET Test 126

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NEET Test 126

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following types of antibodies are produced in a person who is hypersensitive to peanuts?

A
IgA

B
IgE

C
IgD

D
IgM

Solution

The exaggerated response of the immune system to certain antigens present in the environment is called allergy or hypersensitivity. The substances to which such an immune response is produced are called allergens. The antibodies produced to these are of lgE type. Common examples of allergens are mites in dust, pollens, animal dander, etc. Symptoms of allergic reactions include sneezing, watery eyes, running nose and difficulty in breathing. It happens due to substances like histamine and serotonin.

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

The cyclotron frequency of an electron grating in a magnetic field of 1 T is approximately

A
28 MHz

B
280 MHz

C
2.8 GHz

D
28 GHz

Solution
Question 3
4 / -1

Oxygen is not produced during photosynthesis by __________.

A
Cycas

B
Green sulphur bacteria

C
Chara

D
Nostoc

Solution

Cyclic phosphorylation occurs in green sulphur bacteria, so oxygen is not produced during photosynthesis.

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

What is the dimensions of magnetic field

A

B

C

D

Solution
Question 5
4 / -1

A particle is projected vertically with speed V from the surface of the earth. Maximum height attained by the particle, in terms of the radius of earth R,V and g is (V escape velocity, g is the acceleration due to gravity on the surface of the earth).

A

B

C

D

Solution
Question 6
4 / -1

The curling of Rhododendron leaves is an example of?

A
Hydrotropism

B
Phototropism

C
Thermotropism

D
Thigmotropism

Solution

Thermotropism or thermotropic movement is the movement of a plant or part of a plant in response to a change in temperature. A common example is the curling of Rhododendron leaves in response to cold temperatures.

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

A body of 5 kg is moving with a velocity of 20 m/s. If a force of 100 N is applied on it for 10 s in the same direction as its velocity, what will now be the velocity of the body?

A
200 m/s

B
220 m/s

C
240 m/s

D
260 m/s

Solution
Question 8
4 / -1

Increased in CO₂concentration shall cause:

A
No effect on breathing

B
Slower and shallow breathing

C
Slower and deeper breathing

D
Faster and deeper breathing

Solution

As a general rule, the faster and deeper you breathe, the greater is the air exchange happening in your lungs. This means there is increase in the rate of oxygen uptake by blood and also of carbon dioxide wash-out. So, if you breathe fast and deep, that will clear out maximum amount of carbon dioxide from your blood. Hence, a decrease in blood CO₂ concentration.

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

The least toxic nitrogenous waste is produced by:

A
Mammals and molluscs

B
Birds and lizards

C
Frog and cartilaginous fishes

D
Insects and bony fishes

Solution

Excretion is the act of excreting the excretory substances produced as a result of metabolic activities. Different types of biochemical activities take place inside living cells. During these activities, some waste and toxic footprints are produced which are not useful for the cells or the body. Some harmful and excretory substances are compounds of carbon dioxide, ammonia, urea, uric acid and some other nitrogen. The special organs by which these substances are taken out of the body are called excretory organs. The excretion of uric acid is called uricotelism. The excretion of uric acid is advantageous for those animals which have to conserve water for their survival like birds and lizards.

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

A sphere of mass m and diameter D is Heated by temperature ΔT, if the Coefficient of linear expansion is a what will be the change in the Surface area?

A

B

C

D

Solution