NEET Test 84

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NEET Test 84

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Weekly Quiz Competition

Question 1
4 / -1

The velocity v of a particle at time t is given by v= at + b / t+c where a,b and c are constants. The dimensions of a, b and c are respectively:

A
[LT⁻²], [L] and [T]

B
[L²], [T] and [LT²]

C
[LT²], [LT] and [L]

D
[L], [LT] and [T²]

Solution
Question 2
4 / -1

ABO blood groups in humans are controlled by the gene I. It has three alleles I_A, I_B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

A
Two

B
Three

C
One

D
Four

Solution
Question 3
4 / -1

A long solenoid of 50 cm length having 100 turns carries a current of 2.5A. The magnetic field at the centre of the solenoid is:

A
6.28 × 10^-4T

B
3.14 × 10^-4T

C
6.28 × 10^-5T

D
3.14 × 10^-5T
Question 4
4 / -1

Which of the following compound on heating does not produce metal oxide?

A
Mg CI₂. 6H₂O

B
K₂Cr₂O₇

C
K₂CO₃

D
Cu(NO₃)₂

Solution
Question 5
4 / -1

An element has a body-centered cubic structure with a cell edge of 288 pm. The density of the elements is 7.2 gcm⁻³. Calculate the number of atoms present is 208 g of the element.

A
5.03 × 10²⁴

B
10.06 × 10²⁴

C
2.418 × 10²⁴

D
30.18 × 10²⁴

Solution
Question 6
4 / -1

Which of the following is not true of RNA processing?

A
Exons are excised and hydrolysed before mRNA moves out of the nucleus

B
An initial RNA transcript is much longer than the final RNA molecule that may leave the nucleus

C
RNA splicing may be catalyzed by spliceosomes

D
Existence of exons and introns may facilitate crossing over between regions of a gene that code for polypeptide domains

Solution

In most eukaryotic genes, coding regions (exons) are interrupted by noncoding regions (introns). During transcription, the entire gene is copied into a pre-mRNA, which includes exons and introns. During the process of RNA splicing, introns are excised and hydrolysed before mRNA moves out of the nucleus and exons are joined to form a continuous coding sequence.

Hence, the correct option is (A).
Question 7
4 / -1

The change in population size at a given time interval t, is given by the expression N_t=N₀+B+I−D−E
I,B and D stand respectively for:

A
Rate of immigration, mortality rate, natality rate

B
Rate of immigration, natality rate, the mortality rate

C
Rate of emigration, natality rate, the mortality rate

D
Mortality rate, natality rate, rate of immigration

Solution

N_t=N₀+B+I−D−E is the formula used to calculate the change in population size at a given time interval. Nt is the change in population at time ′t′. NO is the initial population size.

Natality rate also called birth rate for a population. It is a measure of the number of births occurring in a population in a particular time period. It is denoted by the letter B.

The mortality rate is the measure of the number of deaths in a particular population for a particular time period. It is denoted by the letter D

I represent the rate of immigration, which is the number of people entering an area of the population at a particular time interval.

Letter E denotes the rate of emigration, which is the number of people leaving/exiting an area of the population at a particular time interval.

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

Which of the following statements is/are incorrect?

A. The complexion trans-dichloro bis (ethylenediamine) rhodium (III) is optically active.

B. Secondary valencies are non-directional, whereas primary valencies are directional.

C. Both geometrical and optical types of isomerism are shown by [Co(en)₂Cl₂]⁺

A
Only A

B
Only B

C
Only A and B

D
Only C

Solution

The complexion trans-dichloro bis(ethylenediamine) rhodium (III) is an optically inactive Meso compound as it has a plane of symmetry.

Primary valency is satisfied by negative ions whereas secondary valencies are satisfied by negative ions or by neutral molecules. On the other hand, the primary valency is non-directional.
Hence, the correct option is (C).
Question 9
4 / -1

A weightless bag is filled with 5 kg of water and then weighed in water. The reading of spring balance is:

A
5 kgf

B
2.5 kgf

C
1.25 kgf

D
Zero

Solution

Since, the weight of the bag with water is equal to the weight of water displaced, hence reading of the spring balance is zero.

Hence, the correct option is (D).

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NEET Test 84

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NEET Test 84

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Question 1

[LT−2], [L] and [T]

[L2], [T] and [LT2]

[LT2], [LT] and [L]

[L], [LT] and [T2]

Solution

Question 2

Two

Three

One

Four

Solution

Question 3

6.28 × 10-4 T

3.14 × 10-4 T

6.28 × 10-5 T

3.14 × 10-5 T

Question 4

Mg CI2. 6H2O

K2Cr2O7

K2CO3

Cu(NO3)2

Solution

Question 5

5.03 × 1024

10.06 × 1024

2.418 × 1024

30.18 × 1024

Solution

Question 6

Exons are excised and hydrolysed before mRNA moves out of the nucleus

An initial RNA transcript is much longer than the final RNA molecule that may leave the nucleus

RNA splicing may be catalyzed by spliceosomes

Existence of exons and introns may facilitate crossing over between regions of a gene that code for polypeptide domains

Solution

Question 7

Rate of immigration, mortality rate, natality rate

Rate of immigration, natality rate, the mortality rate

Rate of emigration, natality rate, the mortality rate

Mortality rate, natality rate, rate of immigration

Solution

Question 8

Only A

Only B

Only A and B

Only C

Solution

Question 9

5 kgf

2.5 kgf

1.25 kgf

Zero

Solution

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[LT⁻²], [L] and [T]

[L²], [T] and [LT²]

[LT²], [LT] and [L]

[L], [LT] and [T²]

6.28 × 10^-4T

3.14 × 10^-4T

6.28 × 10^-5T

3.14 × 10^-5T

Mg CI₂. 6H₂O

K₂Cr₂O₇

K₂CO₃

Cu(NO₃)₂

5.03 × 10²⁴

10.06 × 10²⁴

2.418 × 10²⁴

30.18 × 10²⁴