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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 It is the outermost layer of the skin. The cells in this layer are called keratinocytes. The keratinocytes are... 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 Natural vegetation implies plants that have not been developed... 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 = v × t = 342 × 3 = 1026 m In the given interval of... 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 on the... 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. Diseases are disorders that cause one to develop... View Article

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

Answer: (a) Mn2+ (a) Mn<sup>2+</sup> Electronic configuration of Mn2+ = [Ar]3d5 Number of unpaired electrons =5 (b)... 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. 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. Amines are organic compounds and functional groups that contain a nitrogen atom with a lone... 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 Amanita phalloides is a type of mushroom. Mushroom comes under the class of kingdom... 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 as the... 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. The temperate grasslands of South Africa are called the velds. Velds are rolling plateaus with... 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 employing... View Article

Which of the following tissues does not possess a vacuole?a)Cambium b)Apical meristem c)Both Cambium and Apical d)Neither Cambium or Apical

Both Cambium and Apical meristem... View Article

An object of mass, m is moving with a constant velocity, v. how much work should be done on the object in order to bring the object to rest?

Answer: The kinetic energy of an object of mass m, moving with a velocity, v is given by the expression, K.E = 1/2 mv2 In order to bring it to... View Article

The velocity of a body of mass 15 kg increases from 5 m/s to 10 m/s when a force acts on it for 2 s. What is the gain in momentum per second?

Mass of the body, m = 15 kg Initial velocity, u = 5 m/s Final velocity, v = 10 m/s Time, t = 2s Initial Momentum, p1 = mu = 15 × 5 = 75 kg... View Article

Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?

When we push a huge rock, there is no transfer of muscular energy to the stationary rock. Also, there is no loss of energy because muscular... View Article

Which one acts as both oxidising as well as reducing agent? a.CH₂O₂ b.HNO₂ c.KNO₃ d.O₂

Answer : (b) HNO2 Nitrous acid is unstable and weakly acidic compound. It exists in the solution of nitrate salts only. Nitrous acid is a... View Article

Which of the following reasons does not lead to water scarcity? a. Deforestation b. Green House Gases c. Droughts d. Construction of Large Dams

Answer Option (d) Construction of Large Dams Water is one of the basic necessities for every living being and we cannot imagine a life without... View Article

An electric heater of resistance 8Ω draws 15 A from the service mains for 2 hours. Calculate the rate at which heat is developed in the heater.

Answer: Given parameters The resistance of the electric heater (R) = 8 Ω Current drawn (I) = 15 A Time = 2 hrs T = 120 min x 60 Time (T) =... View Article

Which of the following heart tissues is known as the pacemaker? (1) Sinoatrial node (2) Atrioventricular node (3) Purkinje fibres (4) His bundle

Answer: (1) Sinoatrial node The sinoatrial node or SA node is called the natural pacemaker of the heart. The impulse initiates in a small... View Article

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