What was the life expectancy in India during British rule? (a) 30 years (b) 32 years (c) 35 years (d) 40 years
As per the Government issued data, life expectancy during British India was 32 years and today it is 68 years.... View Article
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State the main function of lymphocytes
Lymphocytes play a major role in adaptive immunity. The B cells are responsible for humoral immunity and T cells are... View Article
Newtons law of cooling is a special case of (a) Kirchoff’s law (b) Weins law (c) Stefan-Boltzmanns law (d) Plancks law
Newtons law of cooling is a special case of Stefan’s-Boltzmann law. It is derived from Stefan’s law. Hence, the correct... View Article
In soil, water available to plants roots is (a) Hygroscopic water (b) Capillary water (c) Gravitation water (d) Colloid water
Capillary water The water present in narrow soil spaces is called capillary water, available to plant roots for absorption. It... View Article
Refractive index depends on the __________of light
Refractive index depends on the wavelength of light The change in the speed of light causes it to bend which... View Article
In an n-p-n transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector: (a) The base current will be 1 mA (b) The base current will be -1 mA (c) The emitter current will be 9 mA (d) The emitter current will be 15 mA
Given Collector current, Ic = 10 mA According to the question, Ic = 90% of IE 10mA = (90/100)IE IE... View Article
What is the absolute mass and charge of a proton?
Mass of Proton – The mass of a proton is equal to that of the hydrogen atom. A hydrogen atom... View Article
State whether each of the following statements are true or false. If the statement is false rewrite the given statement correctly (i) If P = {m, n} and Q = {n, m} then P x Q = {(m x n), (n, m)} (ii) If A and B are non-empty sets then A x B is a non-empty set of ordered pairs (x, y) such that x ∈ A and y ∈ B (iii) If A = {1, 2}, B = {3, 4} then A x (B∩ϕ ) = ϕ
(i) Given P = {m,n} and Q = {n, m} then P x Q = {(m, n), (m, m), (n,... View Article
A bullet of mass 50 g is moving with a velocity of 500 m/s^-1. It penetrates 10 cm into a still target and comes to rest. Calculate: (a) the kinetic energy possessed by the bullet, and (b) the average retarding force offered by the target
Given Mass of bullet = 50 g = 0.05 kg Velocity = 500 m/s Distance penetrated by the bullet =... View Article
Explain the following statement with reasons. Television is the most popular medium
Television is the most popular medium of communication because of the following reasons: 1. It is an audio-visual medium of... View Article
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out _________ (a) In the presence of NaCl (b) In the presence of fluorite (c) In the presence of cryolite which forms a melt with lower melting temperature (d) In the presence of cryolite which forms a melt with higher melting temperature
The Hall-Heroult process is widely used in the extraction of aluminium. In Hall-Heroults process, pure Al2O3 is mixed with CaF2... View Article
What do you mean by linear pair of angles?
Linear pair of angles are formed when two lines intersect each other at a single point. The angles are said... View Article
A prokaryotic autotrophic nitrogen fixing symbiont roots are found in (a) Alnus (b) Cycas (c) Cicer (d) Pisum
A prokaryotic autotrophic nitrogen fixing symbiont roots are found in cycas. Hence, the correct option is (b)
A family consists of two grandparents two parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family? (a) 28 (4/7) years (b) 31 (5/7) years (c) 32 (1/7) years (d) None of these
Required average = (67 x 2 + 35 x 2 + 6 x 3)/ (2 + 2 + 3) =... View Article
Which of the following is not a transmission medium? (a) Telephone lines (b) Coaxial cable (c) Modem (d) Microwave systems (e) Satellite systems
Modem is not a transmission medium. Therefore, the correct option is (c)
Change the following statement into passive voice. We all know that there is only one God
The passive voice of the given statement is as follows: It is known to us all that there is only... View Article
Appearance of antibiotic resistant bacteria is an example of(a) Adaptive radiation(b) Transduction(c) Pre-existing variation in the population(d) Divergent evolution
The correct answer is (c) pre-existing variation in the population The appearance of antibiotic-resistant bacteria is an example of pre-existing variation in... View Article
A chord of a circle is equal to the radius of the circle. Find the angle subtended by the chord at a point on the minor arc and also at a point on the major arc.
The chord AB is equal to the radius of the circle. OA and OB are the two radii of the... View Article
What effect does branching of an alkane chain has on its boiling point?
Alkanes encounter Van-der Waals forces between molecules. The higher the alkane’s power, the greater is the boiling point. As the... View Article
If Driver = 12, Pedestrian = 20, Accident = 16, then Car = ? (a) 3 (b) 6 (c) 8 (d) 10
Clearly, we can find that each word is coded by the numeral which is twice the number of letters in... View Article
