Examine whether the following are polygons. If anyone among these is not, say why?
(a) As it is not a closed figure, therefore, it is not apolygon. (b) It is a polygon because it... View Article
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Identify the smallest ion among the following: i) Al3+ ii) Na+ iii) Ba2+ iv) Mg2+
The correct answer is option (i) – Al3+ More the nuclear charge on ion, electrons are more strongly attracted and... View Article
Why is variation beneficial to the species but not necessarily for the individual?
Answer: Variations are important for species survival because variation causes the organism to overcome extreme situations. Organism species occupy well-defined... View Article
Do you think that it is better to use compost instead of chemical fertilizers? Why
Yes, it is better to use compost instead of chemical fertilizers. Compost It is how farm waste material like livestock... View Article
If a plant has fibrous roots, what type of venation are its leaves likely to have?
Plants with fibrous roots have parallel venation in their leaves. For example, grass, wheat maize, etc., have fibrous roots with... View Article
Calculate the number of molecules of Sulphur (S8) present in 16 g of solid Sulphur.
We have to find the number of molecules present in 16g of solid sulphur. The molecular mass of the sulphur... View Article
Identify the amphoteric oxide from the following: i) Al2O3 ii) SO2 iii) P2O5 iv) CaO
Amphoteric oxides like aluminium oxide react with both acids and bases. What are Amphoteric oxides? Amphoteric oxides react with both acids... View Article
Convert into mole. (a) 12 g of oxygen gas(b) 20 g of water (c) 22 g of carbon dioxide
Answer: A mole is defined as the amount of a substance that contains exactly 6.02214076 × 1023 elementary entities of... View Article
Which amongst the following contains triple bond? i) C2H3 ii) C2H2 iii) C2H4 iv) C3H4
CH≡CH is the structural formula of C2H2, so the C2H2 contains a triple bond Triple bond, in chemistry, a covalent linkage... View Article
Which of the following will not represent zero: (a) 1 + 0 (b) 0 x0 (c) 0/2 (d) 10-10/2
Answer: (a) 1 + 0 Consider the option (a) 1+0 =1 ≠ 0 It does not represent zero. Consider the option (b)... View Article
Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?
Answer: In birds and mammals have a double circulation system where both the oxygenated and deoxygenated blood maintains separate. Warm-blooded... View Article
What are the limitations of extracting energy from – (a) the wind? (b) Waves? (c) Tides?
a)The wind A windmill requires a wind of speed more than 15 km/h to generate electricity from wind energy also... View Article
Select conductor of heat from the following: i) Paper ii)Aluminium iii) Plastic iv) Rubber
(ii) Aluminium is a conductor of heat. Aluminium is an excellent heat and electricity conductor and, concerning its weight, is almost twice as good a conductor as copper. In... View Article
Which of the following lay eggs? i) Platypus and Echidna ii) Humans iii) None of the above
Platypus and Echidna The platypus echidnas are the world’s only monotremes or egg-laying mammals. There are two species of echidnas,... View Article
Answer: (iii) Dacron Dacron is a condensation polymer. The condensation polymers are formed by repeated condensation reaction between two different... View Article
The countries bordering North India are: i) Pakistan ii) Nepal iii) Bhutan iv) All of the above
All of the above Neighbouring countries of India India is located in the Southern part of Asia. It is the... View Article
Purine derivative among the following bases is: i) Guanine ii) Cytosine iii) Uracil iv) Thymine
Guanine Purine and Pyrimidine Purine is a heterocyclic aromatic organic compound composed of a pyrimidine ring fused with an imidazole ring.... View Article
Differentiate between parenchyma, collenchyma and sclerenchyma, on the basis of their cell wall.
Tissue provides structural strength, mechanical strength and shows division of labour. A collective number of tissues form organs in the... View Article
Chromosomes are arranged along the equator during a) prophase b)metaphase c)anaphase d)telophase
Answer: (b) metaphase During metaphase chromosomes are arranged on a plane which is known as an equatorial plate. Metaphase is... View Article
An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.
Answer: Given An electric iron of resistance 20 Ω takes a current of 5 A Find out We have to calculate... View Article
