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Which of the following cannot be prepared by Kolbe’s electrolysis process? i) Methane ii) Ethyne iii) Ethane iv) None of these

Answer (ii) Ethyne Kolbe’s electrolytic process is used to prepare alkanes. In this process, the alkane is produced through electrolysis of... View Article

Which of the following has least bond dissociation energy ? a.F₂ b.Cl₂ c. Br₂ d. I₂

I2 has least bond dissociation energy due to its largest size.... View Article

Which of the following is not an element of phloem tissue? (1) Tracheidit (2) Sieve tubes (3) Phloem fibres (4) Companion cells

Answer: (1) Tracheidit Phloem is a living tissue in vascular plants which conducts the soluble organic compounds synthesized during... View Article

Which among the following is an examples of secondary cells?a)Leclanche cell b)Lead-storage battery c)Dry cell d) Alkaline cell

Answer (b) Lead storage battery The lead-acid battery is also known as a lead storage battery. Lead-acid batteries can be classified as... View Article

Which of the following are the temperate grasslands of North America? i) Eurasian steppes ii) Pampas iii) Prairies iv) Chaurs

Answer (iii) Prairies The temperate grasslands of North America are known as the Prairies. It is a region of flat, gently sloping or hilly... View Article

Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?

Answer: As per ohm's law of electrical resistance, the thickness of the conductive wire is inversely proportional to the amount of resistance.... View Article

Find the difference between the greatest and the least number that can be written using the digits 6, 2, 7, 4, 3 each only once.

Few digits: 6, 2, 7, 4, 3 We need to find the difference between the greatest number and the least number formed using these given digits and... View Article

Which among the following does not belong to phylum Platyhelminthes? a.Roundworm b.Planeria c.Fasciola d.Echinococcus granulosus

Answer (a) Roundworm Roundworm belongs to the kingdom Aschelminthes commonly called nematodes. Phylum Platyhelminthes belongs to the kingdom... View Article

Which of the following best describes a sol-gel colloidal system? i) Butter and milk ii) Blood iii) Beaten egg whites iv) Paper

Answer (i) Butter and milk Butter is gel and milk is sol. A colloid is a mixture in which one substance of dispersed insoluble particles is... View Article

Which of the following is an example of the fold mountain? i) The Himalayas ii) Mount Fuji iii) Appalachian mountain iv) Tetons

Answer (a) The Himalayas Fold mountains are formed by the effects of folding on layers within the upper part of the Earth's crust. Prior to... View Article

Which of the following group contain mostly radioactive elements ? a)actinoids b)alkaline earth metals c) halogens d) Non metals

Answer (a) Actinoids Radioactive elements are composed up of atoms whose nuclei are unstable and give off atomic radiation as part of a... View Article

Which set of quantum numbers is correct with n = 3?a. l = 3 , m1 = – 3 b.l = 2 , m1 = + 2 c. l = 2 , m1 = + 3 d. l = 4 , m1 = – 1

For given n, the possible l values are 0, 1, and 2. For l =0, possible ml values is 0. For l =1, possible ml values are: +1,0, -1. For l =2,... View Article

Which one of the following scientist discovered nucleus of an atom? a. Rutherford b. Michael Faraday c. Neils Bohr d. Enrico Fermi

Answer (a) Rutherford Nucleus was discovered by Rutherford in the alpha particle scattering experiment. In 1911, Rutherford, Marsden and Geiger... View Article

Which of the following animal does not belong to phylum Echinodermata? i) Starfish ii) Eocrinoidea iii) Sea cucumber iv) Chiton

Answer ( iv) Chiton Chiton belongs to the phylum Mollusca. These are multicellular organisms with well-developed organ systems. All the... View Article

Choose the correct option from the list which is not an example of cartilaginous fish: i) Sawfish ii) Stingray iii) Rohu iv) Shark

Answer (iii) Rohu fish Cartilaginous fishes fall under the class Chondrichthyes. They are primarily comprised of cartilage. Cartilaginous fish... View Article

Ionic bond is present in which of the following species: a. Sodium Bromide b. Sulfur Trioxide c.Hydrogen Chloride d.Carbon Monoxide

An ionic bond is present in (a)Sodium Bromide. The electrostatic force of attraction which holds the two oppositely charged ions together is... View Article

What are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.

Cellular respiration is a process that takes place inside the cells, where the breakdown of glucose molecules releases energy. The process can be... View Article

A child has less body weight. He has a thin face, Loss of weight, Failure to gain muscle mass. Which disease is the child suffering from?

If a child has less body weight. He has a thin face, loss of weight, failure to gain muscle mass then the child must be suffering from the... View Article

Which of the following can be recharged by passing direct current: i) Lithium ion batteries ii) Fan iii) Bulbs iv) Electric motors

(i) Lithium-ion batteries The lithium-ion battery, often shortened to LIB, is a variety of secondary battery which is rechargeable. Within the... View Article

Which of the following acids is not found in acid rain? i) Carbonic acid ii) Sulphuric acid iii) Nitric acid iv) None of the above

Correct option (iv) None of the above Acid rain contains mineral acids like carbonic acid, sulphuric acid and nitric acid. Acid Rain is... View Article

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