Science & Technology mcqs#4
Q 1.Fruits stored in a cold chamber exhibit longer storage life because
a.exposure to sunlight is prevented
b.concentration dioxide in the is increased of carbon environment
c.rate of respiration is decreased
d.there is an increase in humidity
Ans – c
Q 2.Ball bearings are used in bicycles, cars, etc., because
a.the actual between the is increased area of contact wheel and axle
b.the effective between the is increased area of contact wheel and axle
c.the effective between the is reduced area of contact wheel and axle
d. None of the above statements is correct
Ans – c
Q 3.Consider the following phenomena:
1. Size of the sun at dusk
2. Colour of the sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky
Which of the above are optical illusions?
a,1, 2 and 3
b.3, 4 and 5
c.1, 2 and 4
d.2, 3 and 5
Ans – c
Q 4.Rainbow is produced when sunlight falls on drops of rain.
Which of the following physical phenomena are responsible for this?
1. Dispersion
2. Refraction
3. Internal reflection
Select the correct answer using the codes given below.
a.1 and 2 only
b. and 3 only
c.1 and 3 only
d.1, 2 and 3
Ans -d
Q 5.Many transplanted seedlings do not grow because
a. the new soil does not contain favourable minerals
b.most of the root hairs grip the new soil too hard
c.most of the root hairs are lost during transplantation
d leaves get damaged during transplantation.
Ans – c
Q 6.Which of the following statements is / are correct?
1. Viruses lack enzymes necessary for the generation of energy.
2. Viruses can be cultured in any synthetic medium.
3. Viruses are transmitted from one organism to another by biological vectors only.
Select the correct answer using the codes given below.
a.1 only
b.2 and 3 only
c.1 and 3 only
d. 1, 2 and 3
Ans – b
Q 7.The known forces of nature can be divided into four classes, viz, gravity electromagnetism, weak nuclear force and strong nuclear force. with reference to them, which one of the following statements is not correct?
a.Gravity is the strongest of the four
b.Electromagnetism act only on particles with an electric charge
c.Weak nuclear force causes radioactivity
d.Strong nuclear force holds protons and neutrons inside the nuclear of an atom.
Ans – a
Q 8.The efforts to detect the existence of Higgs boson particle have become frequent news in the recent past. What is /are the importance/importances of discovering this particle?
1. It will enable us to understand why elementary particles have mass.
technology to transferring matter from one point to another without traversing the physical space between them.
3. It will enable us to create better fuels for nuclear fission.
Select the correct answer using the codes given below:
a.1 only
b.2 and 3 only
c.1 and 3 only
d.1, 2 and 3
Ans – a
Q9. Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to
1. resist drought and increase absorptive area
2. tolerate extremes of PH
3. Resist disease infestation
Select the correct answer using the codes given below:
a.1 only
b.2 and 3 only
c.1 and 3 only
d.1, 2 and 3
Ans – d
Q 10.Government of India encourages the cultivation of ‘sea buckthorn’. What is the importance of this plant?
1. It helps in controlling soil erosion and in preventing desertification.
2. It is a rich source of biodiesel.
3. It has nutritional value and is well-adapted to live in cold areas of high altitudes.
4. Its timber is of great commercial value.
Which of the statements given above is/ are correct?
a.1 only
b.2, 3 and 4 only
c.1 and 3 only
d.1, 2, 3 and 4
Ans – c