General Science MCQs Set [98]

[971] Which of the following is/are true about Diamond?

[1] In a diamond crystal, each carbon atom is linked to four other carbon atoms by covalent bonds in a tetrahedral fashion.

[2] Diamond is a very hard substance.

[3] The only other substance harder than diamond is silicon carbide which is also known as carborandum.

Which of the statements given above are correct?

[A] 1 and 2 only

[B] 1 and 3 only

[C] 2 and 3 only

[D] 1, 2 and 3


[972] Name the bacteria which live in the roots of the leguminous plants and are responsible for nitrogen fixation.

[A] Acetobacter

[B] Actinobacillus

[C] Rhizobium

[D] Staphylococcus


[973] 99.9% of water vapour is contained in the

[A] Troposphere

[B] Stratosphere

[C] Mesosphere

[D] Thermosphere


[974] Viruses infect

[1] bacteria

[2] plants

[3] animals

Answer options:

[A] 1 and 2 only

[B] 1 and 3 only

[C] 2 and 3 only

[D] 1, 2 and 3


[975] Name the protozoan which causes ‘Malaria’.

[A] Entamoeba histolytica

[B] Blantidium Coli

[C] Blastocystis

[D] Plasmodium


[976] No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be

[A] plane.

[B] concave.

[C] convex.

[D] either plane or convex.


[977] A positively-charged particle [alpha-particle] projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

[A] towards south

[B] towards east

[C] downward

[D] upward


[978] What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.

[A] Hydrogen gas and iron chloride are produced.

[B] Chlorine gas and iron hydroxide are produced.

[C] No reaction takes place.

[D] Iron salt and water are produced.


[979] Ethane, with the molecular formula C2H6 has

[A] 6 covalent bonds.

[B] 7 covalent bonds.

[C] 8 covalent bonds.

[D] 9 covalent bonds.


[980] In evolutionary terms, we have more in common with

[A] a Chinese school-boy.

[B] a chimpanzee.

[C] a spider.

[D] a bacterium.


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