Mix Test

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Mix Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Which among the following is incorrect about chromosomes?

A
Chromosomes are rod shaped structures that condenses together when the cell is about divide

B
Chromosomes are composed of DNA, RNA and proteins which act as repository for inheritance

C
Kinetochores are disc like structures that are present on the sides of centromeres

D
In acrocentric chromosomes, centromere is present in the end of the chromatids

Solution

Chromosomes are rod shaped structures that condenses together when the cell is about divide. Chromosomes are composed of DNA, RNA and proteins which act as repository for inheritance. Kinetochores are disc like structures that are present on the sides of centromeres. In telocentric chromosomes, centromere is present in the end of the chromatids.

Hence, the correct option is (D).
Question 2
1 / -0

Plasmolysis in the plant a cell occurs due to:

A
Exosmosis

B
Endosmosis

C
Absorption

D
Pinocytosis

Solution

Exosmosis is a process due to which the water molecules move from a higher concentration region of the cell to a lower concentration region of the surroundings through the cell membrane. When a cell is kept in a hypertonic solution, it shrinks and exosmosis occurs. Plasmolysis, in a plant cell, is defined as the process in which the cells lose water in a hypertonic solution. Plasmolysis is the shrinkage of the cytoplasm in a hypertonic medium.

So, Plasmolysis in plant cells occurs due to exosmosis.

Hence, the correct option is (A).
Question 3
1 / -0

What is a rod shaped bacteria called?

A
bacilli

B
Spirillam

C
Vibrio

D
Caucus

Solution

There are four common forms of bacteria- coccus, bacillus, spirillum, and vibrio.

A bacillus (plural bacilli), or bacilliform bacterium, is a rod-shaped bacterium or archaeon. Bacilli are found in many different taxonomic groups of bacteria. However, the name Bacillus, capitalized and italicized, refers to a specific genus of bacteria. This group includes most of the bacteria. They are Rod-shaped. Eg - E.coli, Bacillus anthracis.

Coccus form: These are spherical bacteria. Streptococcus pneumonaie, the bacterium that causes pneumonia in human beings, is a coccus bacterium.

Spirilla form: These are spiral-shaped bacteria that occur singly.

Vibrio form: These are comma-shaped bacteria. Vibrio cholera, which causes cholera, is one such bacterium.

Hence, the correct option is (A).
Question 4
1 / -0

In a human female, the anteversion of the uterus during pregnancy is maintained by

A
Rectouterine ligaments

B
Broad ligament

C
Cardinal ligament

D
Round ligament

Solution

The round ligament helps maintain the anteversion position of the uterus during pregnancy. The cardinal ligaments support the uterus. The round ligament of the uterus develops from the gubernaculum. In a fetus, the gubernaculum is an undifferentiated mesenchymal tissue attached to ovarian tissue in a female fetus and testicular tissue in a male fetus. During the early stages of urogenital development in the female fetus, the gubernaculum develops as a connective tissue band.
Hence, the correct option is (D).
Question 5
1 / -0

Numerical values of the momentum and kinetic energy of a particle are equal. Velocity of the particle is:

A
1 ms^-1

B
2 ms^-1

C
4 ms^-1

D
Momentum cannot be equal to the kinetic energy

Solution

Let, \(m\) be the mass of the body and \(v\) be the velocity of the body.
Now, momentum of the body is
\(\mathrm{p}=\mathrm{mv}\)
Kinetic energy is
\(K E=\frac{1}{2} m v^{2}\)
As per given condition,
Say,
Momentum \(=\) Kinetic energy \(=x\)
\(\Rightarrow m v=\frac{1}{2} m v^{2}=x\)
\(\Rightarrow \frac{1}{2} m v^{2}=x\)
\(\Rightarrow \frac{1}{2 m} m^{2} v^{2}=x\)
we know \((\mathrm{mv})^{2}=\mathrm{x}^{2}\)
\(\Rightarrow \frac{1}{2 m} x^{2}=x\)
\(\Rightarrow x=2 m\)
\(\Rightarrow m v=2 m \)
\(\Rightarrow v=2\) ms^-1
Hence, the correct option is (B).
Question 6
1 / -0

Which one of the following can respire in the absence of oxygen?

A
Fish

B
Frog

C
Yeast

D
Man

Solution

Yeast can respire in the absence of oxygen(anaerobic respiration).

Anaerobic respiration involves the breakdown of carbohydrates in the absence of oxygen. Yeast reproduces rapidly and produces carbon dioxide during respiration. It is reproduced through budding.

Hence, the correct option is (C).

Question 7

1 / -0

The Chakrashila Wildlife Sanctuary is located in:

Assam

Tripura

Meghalaya

Uttar Pradesh

Solution

Chakrashila Wildlife Sanctuary is located in Chakrashila Hill, Assam. It is famous for the golden langur and is the second protected habitat for golden langur in India.

State	Wildlife Sanctuary
Assam	Garampani WLS, Laokhowa WLS, Pani Dihing WLS, Dehing Patkai WLS, Borail WLS, Deepor Beel WLS
Tripura	Sepahijala WLS, Gumti WLS, Rowa WLS
Meghalaya	Baghmara Pitcher Plant WLS, Nongkhyllem WLS, Narpuh WLS
Uttar Pradesh	Chandra Prabha WLS, Katarniaghat WLS, Kaimoor WLS, Mahavir Swami WLS

Hence, the correct option is (A).

Question 8
1 / -0

Components causing air pollution:

A. CFCs

B. Excess of Carbon di oxide emission

C. Carbon monoxide

D. Sulphur di oxide

A
A, B, C

B
B, C

C
A, D, B

D
A, B, C, D
Solution
The quality of the air in our atmosphere is deteriorating rapidly due to the incorporation of harmful amounts of gases, dust and fumes. The substances that constitute the air pollution are the pollutants.
- Chloroflurocarbons (CFCs) is threat to ozone layer.
- Carbon monoxide mixes with blood and reduces oxygen lavel.
- Excess of Carbon di oxide causes increase in temperature causing global warming.
- Sulphur di oxide causes respiratory issues and acid rain.
Hence, the correct option is (D).
Question 9
1 / -0

An object \(5\) cm tall is placed \(1\) m from a concave spherical mirror which has a radius of curvature of \(20\) cm. The size of the image is:

A
\(0.11\) cm

B
\(0.50\) cm

C
\(0.55\)cm

D
\(0.60\) cm

Solution

Given:

Object distance \( (u) = 1\) m \(= - 100\) cm, radius of curvature \( (R) = - 20\) cm and height of object \(\left(h_{0}\right)=5\) m

The relationship between the focal length (f) and radius of curvature (R) is given by –

\(f=\frac{R}{2}\)

\(\therefore f=\frac{-20}{2}=-10 \mathrm{~cm}\)

\(\frac{1}{v}+\frac{1}{u}=\frac{1}{f}\)

\(\therefore \frac{1}{v}=\frac{1}{f}-\frac{1}{u}\)

\(=\frac{-1}{10}+\frac{1}{100}\)

\(=\frac{-10+1}{100}=-\frac{9}{100}\) cm

\(⇒{v}=-\frac{100}{9} \) cm

\(m=\frac{h_{i}}{h_{o}}=-\frac{v}{u}\)

\(\therefore \frac{h_{i}}{5}=-\frac{\left(-\frac{100}{9}\right)}{(100)}=-\frac{1}{9}\)

\(h_{i}=-\frac{5}{9}=0.55 \) cm

Hence, the correct option is (C).
Question 10
1 / -0

Which of the following human eye defects is for short-sightedness, in which a person can see the near objects clearly but not far objects?

A
Presbyopia

B
Myopia

C
Hypermetropia

D
Astigmatism

Solution

Near-sightedness, or myopia, is a vision condition in which people can see close objects clearly, but objects farther away appear blurred. People with myopia can have difficulty clearly seeing a movie, TV screen and the whiteboard in school. Diagnose of this problem by concave lenses.

Hence, the correct option is (B).

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Mix Test - 5

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Mix Test - 5

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SHARING IS CARING

Question 1

Chromosomes are rod shaped structures that condenses together when the cell is about divide

Chromosomes are composed of DNA, RNA and proteins which act as repository for inheritance

Kinetochores are disc like structures that are present on the sides of centromeres

In acrocentric chromosomes, centromere is present in the end of the chromatids

Solution

Question 2

Exosmosis

Endosmosis

Absorption

Pinocytosis

Solution

Question 3

bacilli

Spirillam

Vibrio

Caucus

Solution

Question 4

Rectouterine ligaments

Broad ligament

Cardinal ligament

Round ligament

Solution

Question 5

1 ms-1

2 ms-1

4 ms-1

Momentum cannot be equal to the kinetic energy

Solution

Question 6

Fish

Frog

Yeast

Man

Solution

Question 7

Assam

Tripura

Meghalaya

Uttar Pradesh

Solution

Question 8

A, B, C

B, C

A, D, B

A, B, C, D

Solution

Question 9

\(0.11\) cm

\(0.50\) cm

\(0.55\)cm

\(0.60\) cm

Solution

Question 10

Presbyopia

Myopia

Hypermetropia

Astigmatism

Solution

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1 ms^-1

2 ms^-1

4 ms^-1