NEET Test 132

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NEET Test 132

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Weekly Quiz Competition

Question 1
4 / -1

The pK_b value of ammonium hydroxide is 4.75. An aqueous solution of ammonium hydroxide is titrated with HCl. The pH of the solution at the point where half of the ammonium hydroxide has been neutralized will be:

A
9.25

B
8.25

C
7.50

D
4.75

Solution
Question 2
4 / -1

Through which of the following modes of communication can radio waves be sent from one place to another?

A
Ground wave propagation.

B
Skywave propagation.

C
Space wave propagation.

D
All of the above.

Solution

Radio waves are generated artificially by transmitters and received by radio receivers, using antennas. Radio waves are very widely used in modern technology for fixed and mobile radio communication, broadcasting, radar and radio navigation systems, communications satellites, wireless computer networks and many other applications. Different frequencies of radio waves have different propagation characteristics in the Earth's atmosphere; long waves can diffract around obstacles like mountains and follow the contour of the earth (ground waves), shorter waves can reflect off the ionosphere and return to earth beyond the horizon (skywaves), while much shorter wavelengths bend or diffract very little and travel on a line of sight, so their propagation distances are limited to the visual horizon.
Question 3
4 / -1

Leaf tendrils and stem tendrils are the two types of tendrils. Which of the following plants have leaf tendrils that are positively thigmotropic?

a. Peas
b. Passion flower
c. Glory lily
d. Bottle gourd

A
Only a and b

B
Only a and c

C
Only a and d

D
Only b and c

Solution

Tendrils are the thin, thread-like growths on the stems or leaves of climbing plants. The two types of tendrils are stem tendrils and leaf tendrils. The tendrils grow towards the things they happen to touch. This phenomenon is known as thigmotropism.

Peas and glory lily plants have leaf tendrils that are positively thigmotropic.
Question 4
4 / -1

Which among the following sentence is not correct about the organelles?

A
They are found in all Eukaryotic cells.

B
They are found in multicellular organisms.

C
They coordinate to produce the cell.

D
They are small sized and mostly internal.

Solution

Organelles are found in all Eukaryotic cells. They coordinate to produce the cell. They are small-sized and mostly internal. Organelle, any of specialised structures inside a cell that perform a specific function (e.g. mitochondria, ribosomes, endoplasmic reticulum). Organelles in unicellular organisms are the equivalent of organs in multicellular organisms.
Question 5
4 / -1

The technique for DNA fingerprinting was developed by:

A
Alec Jeffreys

B
Frederick Sanger

C
Frederick Griffith

D
Jacob and Monod

Solution

The technique for DNA fingerprinting was developed by Alec Jeffreys.

It is based on DNA polymorphism. Humans are almost 99.9% identical and the rest 0.1% constitutes about 3 million differences in our genome.

DNA polymorphism: These are inheritable mutations that occur at a high frequency in a population.

Such variations occur frequently in non-coding DNA sequences and keep accumulating over generations.

These mutations are the basis of variability or polymorphism in a population.

Satellite DNA shows high degree of polymorphism and hence, was used by Jeffreys for DNA fingerprinting. The DNA probes used were VNTRs.

VNTR: Variable Number of Tandem Repeats or VNTRs are composed of 8-80 bp sequences which are tandemly repeated to form 1-30kb length of DNA.
Question 6
4 / -1

The motor of an electric train can give it an acceleration of 1 m/s² and its brakes can give it a negative acceleration of 3 m/s². The shortest time in which the train can make a trip between two stations 1350 m apart is

A
14.5 s

B
28.4 s

C
60 s

D
113.6 s

Solution
Question 7
4 / -1

The vapour pressure of a solvent decreased by 10 mm of Hg when a non-volatile solute was added to the pure solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in vapour pressure is required to be 20 mm of Hg?

A
0.4

B
0.8

C
0.6

D
0.2

Solution

The equation governing the change in the vapor pressure when you use a nonvolatile liquid or solid is just a special case of Raoult's Law, P_total = P_aX_a + P_bX_b. Since the second component has a negligible vapor pressure (nonvolatile), Raoult's law reduces to P = P⁰X

Where P is the vapor pressure of the mixture, P⁰ is the vapor pressure of the pure solvent and X is the mole fraction of the solvent.
Question 8
4 / -1

In the equation where P is the pressure, y is the distance, k_B is Boltzmann constant and T is the temperature. Dimensions of β are:

A
M⁰L²T⁰

B
M¹L^-1T^-2

C
M⁰L⁰T⁰

D
M^-1L¹T²

Solution
Question 9
4 / -1

Which of the following shows the numbers of the producers, herbivores and the carnivores at their successive trophic levels?

A
Food web

B
Food chain

C
Pyramid of biomass

D
Pyramid of numbers

Solution

Pyramid of numbers is the number of organisms in a food chain can represent graphically in a pyramid. Each bar represents the number of individuals at each trophic level in the food chain. Hence pyramid of numbers represent the number of herbivores and the carnivores at their successive trophic levels.
Question 10
4 / -1

The decomposition of Cl₂O₇ at 400 K in the gas phase to Cl₂ and O₂ is a first order reaction. After 55 seconds at 400 K, the pressure of Cl₂O₇ falls from 0.062 atm to 0.044 atm. Calculate the pressure of Cl₂O₇, after 100 sec. of decomposition at the temperature.

A
0.033

B

0.044

C
0.055

D
None of the above

Solution