NEET Test 142

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NEET Test 142

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Weekly Quiz Competition

Question 1
4 / -1

Two isomeric compounds can be distinguished by the use of:

A

B
Tollens reagent

C
Both and Tollens reagent

D
, Tollens reagent and ceric ammonium nitrate

Solution
Question 2
4 / -1

Two ideal junction diodes D₁ and D₂are connected to a battery as shown in the figure. What is the current supplied by the battery if its terminals are interchanged?

A
0.25 A

B
0.5 A

C
0.75 A

D
zero

Solution

When the terminals are reserved D₁ is then reverse biased which will fetch no current, so the resistance 10 ohm is out from the scene now, the current is equal to the resistance and since D₂ is forward biased 20 ohm resistance will only be counted therefore current is equal to 5/20 = 0.25A.
Question 3
4 / -1

From B₂H₆, all the following can be prepared except:

A

B

C

D

Solution
Question 4
4 / -1

Figure shows three resistor configurations R₁,R₂ and R₃ connected to 3 V battery. If the power dissipated by the configuration R₁,R₂ and R₃ is P₁,P₂ and P₃ respectively then:

A

B

C

D

Solution
Question 5
4 / -1

A 800-MW steam power plant, which is cooled by a nearby river, has a thermal efficiency of 40% Rate of heat transfer to the river water is _______ MW.

A
1200

B
1400

C
1600

D
1800

Solution

Given,

Work output by Steam power plant = 800 MW,

Thermal efficiency = 40%,

Rate of heat transfer to the river water (Sink)
Question 6
4 / -1

Destruction of the anterior horn cells of the spinal cord would result in loss of

A
Voluntary motor impulses

B
Sensory impulses

C
Integrating impulses

D
Commissural impulses

Solution

Motor neurons in the nuclei of the brainstem cranial nerves are homologous to the spinal cord anterior horn cells. The destruction of the anterior horn cells of the spinal cord would result in the loss of voluntary motor impulses because it is majorly related to the motor impulses.
Question 7
4 / -1

Two masses m₁ = 6 kg and m₂= 4 kg are connected by means of a string that passes over a frictionless pulley as shown in the figure. When the masses are released, what is the acceleration of the masses? Take g = 10 ms^–2.

A
2 ms^–2

B
4 ms^–2

C
8 ms^–2

D
10 ms^–2

Solution

Since 6kg is heavier than 4 kg so it will accelerate down while 4 kg will accelerate up

So the equation of net force on 6 kg is given as

6×10−T=6 a

equation of net force on 4 kg is given as

T−4×10=4 a

now add the above two equations

6×10−(4×10)=(6+4)×a

60 - 40 = 10 a

a = 2 m/s²

So 6 kg will accelerate downwards while 4 kg will accelerate upwards with an acceleration of 2 ms^–2.
Question 8
4 / -1

Vexillum is found in __________.

A
Cruciferae

B
Rosaceae

C
Solanaceae

D
Papilionaceae

Solution

Fabaceae or Papilionaceae is a large and economically important family of flowering plants. Vexillary aestivation is seen in members of Fabaceae. In vexillary aestivation, the outermost posterior petal is large which is known as the vexillum or standard, two lateral petals are known as the wings or alae, and the two anterior and innermost petals are united to form a boat-shaped structure known as the keel or carina. Hence, vexillum is found in Papilionaceae.
Question 9
4 / -1

Two bodies A and B have thermal emissivities of 0.01 and 0.81 respectively. The outer surface area of the two bodies are the same. The two bodies radiate energy at the same rate. The wavelength λ_B, corresponding to the maximum spectral radiancy in the radiation from B, is shifted from the wavelength corresponding to the maximum spectral radiancy in the radiation from A by 1.00μm. If the temperature of A is 5802 K, then:

A
the temperature of B is 1934 K

B

C

D

Solution
Question 10
4 / -1

Statement A: The process of phloem loading is an active process.

Statement B: The process of phloem unloading is a passive process.

A
Both the statements are true

B
Both the statements are false

C
Statement A is true but Statement B is false

D
Statement B is true but Statement A is false

Solution

Both the process of sucrose loading and unloading in the phloem tissue is an active processes. It is facilitated by the process of osmosis taking place in the adjacent xylem tissue. It develops the water potential gradient which aids the mass movement of sucrose.