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Naturally occurring boron consists of two isotopes whose atomic weights are 10.01 and 11.01. The atomic weight of natural boron is 10.81. Calculate the percentage of each isotope in natural boron.

Let x% be the percentage of isotope with atomic weights 10.01 and (100 – x)% be the percentage of isotope... View Article

Prepare an Accounting Equation from the following: (i) Started business with cash ₹ 1,00, 000 (ii) Purchased goods for cash ₹ 20,000 and on credit ₹ 30, 000 (iii) Sold goods for cash costing ₹ 10,000 and on credit costing ₹ 15,000 both at a profit of 20%

The solution for the given question is shown below

Find the value of 5% of Rs 350

Given 5% of Rs 350 This can be written as Rs 350 x 5/100 = (35 x 5)/10 = 175/10... View Article

In an inductor of selfinductance l = 2mH, current changes with time according to the relation I = t^2e^-t. The time at which the emf becomes zero is (A) 4s (B) 2s (C) 1s (D) 0.5s

Given L = 2mH and I = t2e-t E = -L(dI/dt) = -L [d/dt(t2e-t)] \(\begin{array}{l}E = -L\left | 2te^{-t}-t^{2}e^{-t} \right... View Article

29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl’s method and the evolved ammonia was absorbed in 20 mL of 0.1M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is (A) 59.0 (B) 47.4 (C) 23.7 (D) 29.5

Moles of HCl reacting with ammonia = (moles of HCl absorbed) – (moles of NaOH solution required) = (20 x... View Article

On mixing a certain alkane with chlorine and irradiating it with ultraviolet light it forms only one monochloro alkane. The alkane is: (A) propane (B) pentane (C) isopentane (D) neopentane

Neo-pentane Neo-pentane contains all hydrogen atoms equivalent. Hence, it will give only one monochloro derivative on halogenation Therefore, the correct... View Article

A satellite can be in a geostationary orbit around earth at a distance r from the centre. If the angular velocity of earth about its axis doubles, a satellite can now be in a geostationary orbit around earth if its distance from the centre is (A) r/2 (B) r/2√2 (C) r/(4)^1/3 (D) r/(2)^1/3

Let angular velocity ω ⇒ mrω2 = GMm/r2 ⇒ ω2 = GM/r3 So, \(\begin{array}{l}\omega _{1}^{2}r_{1}^{3}=\omega _{2}^{2}r_{2}^{3}\\r_{2}^{3} = r_{1}^{3}\times (\frac{\omega _{1}}{\omega... View Article

Both respiration and photosynthesis require (A) Sunlight (B) Green cells (C) Cytochromes (D) Organic substrate

Cytochromes Both respiration and photosynthesis require cytochromes. These are the haem bound proteins which help in electron transfer. Hence, they... View Article

Cocaine is derived from (A) Erythroxylon coca (B) Coffea arabica (C) Thea sinensis (D) Cannabis sativa

Erythroxylon coca Cocaine is a tropane alkaloid and stimulant drug obtained primarily from the leaves of two coca species, Erythroxylum... View Article

Peroxy linkage is present in (A) H2SO5 (B) H2SO3 (C) H2SO4 (D) H2S2O7

H2SO5 Caro’s acid (H2SO5) has peroxy linkage. Hence, the correct option is (A)

White blood cells act ___________ (A) as a defence against infection (B) as a source of energy (C) for clotting blood (D) as a medium for oxygen transport from lung to tissues

As a defense against infection White blood cells (WBC’s) serve as a defense system against all pathogens in the human... View Article

Diamond is hard because (A) all the four valence electrons are bonded to carbon atoms by covalent bonds (B) it is a giant molecule (C) it is made up of carbon atoms (D) it cannot be burnt

All the four valence electrons are bonded to carbon atoms by covalent bonds In diamond, each carbon atom is sp3... View Article

Why does the atmospheric pressure go on decreasing as we go higher up above the earth’s surface?

Atmospheric pressure is defined as the pressure exerted by the air that surrounds us.The pressure decreases as we go higher... View Article

The growth of pollen tube toward the ovule is an example of (A) Phototropism (B) Hydrotropism (C) Thigmotropism (D) Chemotropism

Chemotropism The growth of a plant part due to chemical stimulus is known as chemotropism or Chemotropism is the movement... View Article

Who among the following is acknowledged as the father of scientific socialism? (A) Karl Marx (B) V.I. Lenin (C) Jawahar Lal Nehru (D) Mao Tse Tung

Karl Marx is known as the father of Scientific Socialism. Therefore, the correct option is (A)

Locomotory organ found in earthworm is (A) Setae (B) Parapodia (C) Tube feet (D) Walking legs

Locomotary organ found in earthworm is Setae. Therefore, the correct option is (A) Learn more: Earthworm

The centripetal force required by a 1000kg car that takes a turn of radius 50 m at a speed of 36 kmph is: (A) 1000 N (B) 3500 N (C) 1600 N (D) 2000 N

Given Mass = 1000 kg r = 50 m V = 36 kmph = 36 x 5/18 = 10 m/sec... View Article

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