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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 discovered... 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. Phylum Echinodermata These are multicellular organisms with well-developed organ systems.... 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 Fish Cartilaginous fishes fall under the class Chondrichthyes. They are primarily comprised of cartilage. Cartilaginous... 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. What is an ionic bond? The electrostatic force of attraction which holds... 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... 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... 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 What is a lithium-ion battery? The lithium-ion battery, often shortened to LIB, is a variety of secondary... 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.... View Article

Which of the following is not a layer of the epidermis? i) Cornified layer ii) Granular layer iii) Papillary layer iv) Spinous layer

Answer (iii) Papillary layer Epidermis It is the outermost layer of the skin. The cells in this layer are called... View Article

The factors that influence the growth of natural vegetation are: i) Type of land ii) Temperature iii) Precipitation iv) All of these

The factors that influence the growth of natural vegetation are (iv)All of these What is natural vegetation? Natural vegetation implies... View Article

An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m/s?

Speed of sound (v) = 342 ms-1 Echo returns in time (t) = 3 s Distance travelled by sound =... View Article

Plants take carbon dioxide from the atmosphere mainly through their: Option A: roots Option B: stem Option C: flowers Option D: leaves

Answer Option (d) Leaves Plants take carbon dioxide from the atmosphere mainly through their leaves. Stomata are the small opening... View Article

Which of the following is not a symptom of any disease? i) Weakness ii) Frequent urination iii) Changes in bowel habits iv) Meningitis

Answer (iii) Meningitis Meningitis is a disease whereas all others are symptoms of diseases. What is a disease? Diseases are disorders... View Article

Which of the following ions have highest magnetic moment? (a) Mn²⁺ (b) Fe²⁺ (c) Ti²⁺ (d) Cr²⁺

Answer: (a) Mn2+ (a) Mn2+ Electronic configuration of Mn2+ = [Ar]3d5 Number of unpaired electrons =5 (b) Fe2+ Electronic configuration of Fe2+ = [Ar]3d6 Number of unpaired electrons =4 (c) Ti2+... View Article

Find the odd one out (valency is not a criterion). a) Al(OH)₃ b)PB(OH)₂ c)MG(OH)₂ d)ZN(OH)₂

Mg(OH)2, is the odd one out among all the given compounds. Reason All other given compounds are amphoteric hydroxides except Mg(OH)2. Magnesium... View Article

Which of the following compound does not contain a carbonyl group? i) Acetlylacetone ii) Diethyl malonate iii) Amines iv) Meldrum’s acid

Option(iii) Amines do not contain a carbonyl group. What are amines? Amines are organic compounds and functional groups that contain... View Article

Which of the following is not an edible variety of mushroom? i) Maitake ii) Oyster mushrooms iii) Morel mushrooms iv) Amanita phalloides

The mushroom which is not edible is (iv) Amanita phalloides About Amanita phalloides Amanita phalloides is a type of mushroom. Mushroom comes under... View Article

Choose the weathering process which is dominant in dry climate: i) Physical weathering ii) Chemical weathering iii) Biological weathering

The weathering process which is dominant in a dry climate is (i) Physical weathering Weathering The process of weathering is defined... View Article

In which of the following regions do the Velds lie? a)Northern Hemisphere b)Southern hemisphere c)Eastern Hemisphere d)Western Hemisphere

Velds lie in the (b) southern hemisphere. What are velds? The temperate grasslands of South Africa are called the velds. Velds... View Article

Explain the principle and working of an electric motor. What is the function of a split ring in an electric motor?

An electric motor is a device used to transform electricity into mechanical energy opposite to an electric generator. They operate... View Article

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