NEET Test 128

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NEET Test 128

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Weekly Quiz Competition

Question 1
4 / -1

One set of a plant was grown atv 12 hours day and 12 hours night cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?

A
Long day

B
Darkness neutral

C
Day neutral

D
Short day

Solution

One set of a plant was grown at 12 hour's day and 12 hour's night period cycles and it flowered while in the other set night phase was interrupted by the flash of light and it did not produce the flower. We will place this plant under the categories Short day.

It is a short day plant and it fails to flower if the dark period is interrupted by even a flash of light because the conditions indicates that the plant require photoperiod shorter than the critical day length and the plant needs an uninterrupted dark period for flowering.

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

To verify ohm's law, a student is provided with a test resistor R_T a high resistance R₁ a small resistance R₂ two identical galvanometers G₁ and G₂ and a variable voltage source V. The correct circuit to carry out the experiment is:

A

B

C

D

Solution

To verify ohm's law, one galvanometer is used as ammeter and another galvanometer as voltmeter.

Voltmeter should have high resistance (connected in parallel) ammeter should have low resistance (connected in series)

Given: R₁- high resistance, R₂- low resistance

∴ R₁ should be parallel to voltmeter and R₂ should be series with ammeter.

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

A
1.8 × 10²

B
2.8 × 10²

C
3.4 × 10^-2

D
2.8 × 10^-2

Solution
Question 4
4 / -1

Oxidative phosphorylation usually refers to________

A
Anaerobic production of ATP

B
Citric acid cycle production of ATP

C
Alcoholic fermentation

D
None of the above

Solution

The eight steps of the citric acid cycle are a series of redox, dehydration, hydration, and decarboxylation reactions. Each turn of the cycle forms one GTP or ATP as well as three NADH molecules and one FADH2 molecule, which will be used in further steps of cellular respiration to produce ATP for the cell.

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

The temperature of the system decreases in the process of:

A
Free process

B
Adiabatic process

C
Isothermal process

D
Isothermal compression

Solution

Adiabatic processes are processes in which the system cannot exchange energy with the surroundings, so there is ΔQ = 0 for them.

So from the first law of thermodynamics,

ΔQ = dU + ΔW

0 = dU + ΔW

Or dU = −ΔW = −PdV

That is, the work done by the system in the adiabatic process reduces its internal energy, which decreases the temperature of the system.

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

The resistance of the platinum wire of a platinum resistance thermometer at the ice point is 5Ω and at steam point is 5.39Ω. When the thermometer is inserted in a hot bath, the resistance of the platinum wire is 5.795Ω. Calculate the temperature of the bath.

A
245.65^oC

B
345.65^oC

C
135.65^oC

D
145.25^oC

Solution
Question 7
4 / -1

Which of the following contains the same number of atoms as 20 g of calcium Ca?

A
24 g of Mg

B
8 g of Oxygen -atoms

C
12 g of Carbon

D
16 g of Oxygen -atoms

Solution
Question 8
4 / -1

Which disease is caused by eating fish found in water contaminated with industrial waste having mercury?

A
Minamata disease

B
Bright's disease

C
Hashimoto's disease

D
Osteosclerosis

Solution

Minamata disease is a disorder caused by methyl mercury poisoning that was first described in the inhabitants of Minamata Bay, Japan and resulted from their eating fish contaminated with mercury industrial waste.

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

Epidermis, Endothecium, Middle layers, Tapetum are _________.

A
pollen sac layers

B
wall of anther

C
pollen grain layers

D
epidermal

Solution

Epidermis, Endothecium, Middle layers, Tapetum are walls of anther.

The aforementioned parts form the wall of the anther. Epidermis forms the first layer. It surrounds the meristematic cells in young anthers. The second layer is the endothecium. Third layer is the middle layers and the innermost layer is the tapetum.

The anther wall contains four layers called the epidermis, endothecium, middle layer, and tapetum. Inside anther locules, pollen mother cells undergo meiosis to form microspores enclosed in the tetrad. Anther wall layers carry out different functions for pollen formation and release.

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

Consider a metal-semiconductor junction. The variation of the electric field inside the semiconductor is shown in the figure below. The built-in potential (in volts) is equal to:

A
0.665

B
0.875

C
1.12

D
0.934

Solution