NEET Test 97

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NEET Test 97

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following can absorb over 90% of its own mass of water and also does not stick to wounds?

A
Saran

B
Thioko

C
Rayon

D
Gun cotton

Solution

Rayon can absorb over 90% of its own mass of water and also does not stick to wounds. Rayon is a manufactured regenerated cellulose fiber. It is made from purified cellulose, primarily from wood pulp, which is chemically converted into a soluble compound.

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

In a common base mode if the collector and base current are 1.95 mA and 0.5 mA, then the emitter current will be:

A
2.0 mA

B
1.90 mA

C
2.45 mA

D
0.05 mA

Solution

Given:

I_B=1.95 mA,I_C=0.5 mA

As we know,

The electrical relationship between the three transistor currents is

I_E= I_B+I_C

Put the given values in above formula:

I_E=1.95 + 0.5

⇒I_E= 2.45 mA

Therefore, emitter current will be 2.45 mA.

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

Two long straight conductors AOB and COD are perpendicular to each other and carry currents i₁ and i₂. The magnitude of the magnetic induction at a point P at a distance a from the point O in a direction perpendicular to the plane ABCD is :

A

B

C

D

Solution

Conductors AOB and COD are perpendicular to each other shown in figure.
Question 4
4 / -1

The acceleration of a particle performing simple harmonic motion is whose displacement is f(t) = A cos⁡ (ωt + ϕ).

A

B

C

D

Solution

Simple harmonic motion occurs when the restoring force is directly proportional to the displacement from equilibrium.

F ∝−x

Where F= force and x= the displacement from equilibrium.

The equation of displacement in SHM is given by:

x = ACos (ωt + ϕ)...........(i)

where x is the distance from the mean position at any time t,A is amplitude, t is time, and ω is the angular frequency.

The equation of velocity in SHM is given by differentiating equation (i).

where v is the velocity at any time t, A is amplitude, t is time, and ω is angular frequency.

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

The structure which prevents the entry of food particles into the respiratory passage is

A
Sphincter muscles

B
Epiglottis

C
Mouth

D
Oesophagus

Solution

The epiglottis moves back and forth to prevent the passage of food and liquids into the lungs. The usual upright position of the epiglottis allows air to flow into the lungs and the larynx. When you swallow, the epiglottis flattens backward to cover the entrance to your larynx and prevent food from entering the lungs and windpipe. The epiglottis returns to its usual position after swallowing.

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

The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.

A
Iron

B
Copper

C
Calcium

D
Potassium
Question 7
4 / -1

Which of the following plot is correct about the kinetic energy of photoelectrons?

A

B

C

D

Solution

Here plot in option (A) is correct as kinetic energy of photoelectrons is independent of the intensity of radiation. The highest kinetic energy of the optical electron does not depend on the intensity of incident radiation. The opposing potential changes with the frequency of incident radiation.

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

A solenoid of inductance L and resistance R is connected to a battery. The time taken for the magnetic energy to reach 1/4 of its maximum value is:

A
L/R In(1)

B
L/R In(2)

C
L/R In(3)

D
L/R In(4)

Solution

Given: A solenoid of inductance L and resistance R is connected to a battery. The time is taken for the magnetic energy to reach 1/4 of its maximum value is
Question 9
4 / -1

On electrolysis of dilute sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be:

A
Hydrogen gas

B
Oxygen gas

C
H₂S gas

D
SO₂ gas
Question 10
4 / -1

Which of the following forms the basis of the modern periodic table?

A
Atomic mass

B
Atomic number

C
Number of nucleons

D
All of these

Solution

The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons), electron configurations, and recurring chemical properties. This ordering shows periodic trends, such as elements with similar behavior in the same column.

Hence, the correct option is (B).