NEET Test 145

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NEET Test 145

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Weekly Quiz Competition

Question 1
4 / -1

A wheel is rotating at the rate of 33 revolution/min. if it comes to a stop in 20 seconds. Then the angular retardation will be

A
0

B

C

D

Solution
Question 2
4 / -1

The resistance of 0.01 N solution of an electrolyte was found to be 210 oℎm at 298 K, using a conductivity cell of cell constant 0.66 cm⁻¹. The equivalent conductance of the solution is:

A

B

C

D

Solution

Let us consider the specific conductance is given by the equation.
Question 3
4 / -1

It is said that the elemental composition of living organisms and that of inanimate objects (like the earth's crust) are similar in the sense that all the major elements are present in both. Then what would be the difference between these two groups?

Choose the CORRECT answer from among the following:

A
Living organisms have more gold in them than inanimate objects

B
Living organisms have more water in their body than inanimate objects

C
Living organisms have more calcium in them than inanimate objects.

D
Living organisms have more carbon, oxygen and hydrogen per unit mass than inanimate objects.

Solution

In the biosphere, all living and non-living matter is made up of similar elements. The four major elements found in the living organisms are carbon, oxygen, hydrogen, and nitrogen and are found to be more per unit mass as compared to inanimate objects. Thus this will help to differentiate them from the non-living entities. The table gives the difference of the elements present in the Earth's crust and the human body.
Question 4
4 / -1

The heat of combustion of carbon is −94kcal at 1 atm pressure. The intrinsic energy of CO₂ is

A
+94 kcal

B
-94 kcal

C
+47 kcal

D
- 47 kcal

Solution
Question 5
4 / -1

Hypermetamorphosis can be seen in which of the following insects?

A
Suborder Asilomorpha of Dipterans

B
Family Nevrorthidae of Neuroptera

C
Family Meloidae of Coleoptera

D
Order Siphonaptera

Solution

Hypermetamorphosis can be seen in the family Meloidae of Coleoptera. It is a form of complete metamorphosis, occurs in some beetles, flies, and other insects and is characterized by a series of larval stages.
Question 6
4 / -1

Plants growing under direct sunlight are known as:

A
Sciophytes

B
Psamophytes

C
Dicots

D
Heliophytes

Solution

Plants growing under direct sunlight are known as Heliophytes.

The plants which grow best in full sunlight are called heliophytes. Heliophytes have a thicker stem, short internodes, many branches, well-developed roots, thick leathery leaves with more hairs per unit area. Intense light favours the formation of flowers, fruits and seeds. Mechanical tissues and xylem bundles are well developed. Leaf mesophyll is well-differentiated into palisade and spongy parenchyma. The development of palisade parenchyma takes place near the upper surface of the leaf. It protects the inner tissues from intense light. The plants which grow best at lower light intensities are called sciophytes.
Question 7
4 / -1

When the water rises in the capillary tube of radius r to height ℎ, then its potential energy is U₁. If a capillary tube of radius 2r is dipped in the same water then the potential energy of water is U₂. The ratio U₁: U₂ will be-

A
1 : 1

B
1 : 2

C
2 : 1

D
1 : 4

Solution
Question 8
4 / -1

If g is the acceleration due to gravity at the Earth's surface, the gain of the potential energy of an object of mass m raised from the surface of the Earth to height equal to the radius R of the Earth is

A

B

C

D

Solution

Let the potential energy of an object at earth's surface be U₁

Where,

M = mass of earth

m = mass of object

R = radius of the earth

The potential energy of the object at a height, h = R from the surface of the Earth.
Question 9
4 / -1

Green muffler is specific for

A
Reducing smog

B
Sound insulation

C
Preventing haze formation

D
Reducing ground frost

Solution

Device that reduces the noise emitted by the exhaust of an internal combustion engine is called muffler.

Similarly, the process of planting many trees around populated and noisy areas for reducing noise is called as green muffler. Ashoka and Neem are the preferred trees that are planted to decrease the noise pollution in residential areas. Dense trees are known to filter out the noise and obstruct it from reaching the people. The trees act as the sound absorbers.
Question 10
4 / -1

A competitive inhibitor of succinate dehydrogenase is:

A
Malate

B
Oxaloacetate

C
a -ketoglutarate

D
Malonate

Solution

Competitive inhibition is a form of enzyme inhibition where binding of the inhibitor to the active site on the enzyme prevents binding of the substrate and vice versa. Malonate is a competitive inhibitor of the enzyme succinate dehydrogenase: malonate binds to the active site of the enzyme without reacting, and so competes with succinate, the usual substrate of the enzyme.