Express the trigonometric ratios sinA,secA and tanA in terms of cotA.
Sin A: Sin A = 1/cosec A sin A= 1/√(1+cot2A) Sec A: sec A = √(1+tan2A) sec A = √(1+1/cot2A) sec A... View Article
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Define the term basicity of an acid. Give the basicity of nitric acid sulphuric acid and phosphoric acid.
The basicity of acid is the number of H+ ions that can be produced by one molecule of acid in aqueous... View Article
In respiration, air passes through A. Pharynx → nasal cavity → larynx → trachea bronchi → bronchioles → lungs B. Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles → lungs C. Larynx → nasal cavity’ → pharynx → trachea → lungs D. Larynx → pharynx trachea → lungs
Answer: B. Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles → lungs
Which of the following is divisible by 3? A. 12 B. 51 C. 81 D. All the above
Answer: D. All the above A number is divisible by 3, if we add all its digits and the resulting is... View Article
Fluid part of blood after removal of corpuscles is:
a) Plasma b) Lymph c) Serum d) Vaccine Answer: a) Plasma Explanation: Plasma is the amber-coloured, liquid component of the blood... View Article
What happens when PCl5 is heated?
PCl5 decomposes to give PCl3 and Chlorine gas, when heated. Thus, this gives an equilibrium reaction. PCl5 (g) ⇌ PCl3 (g) +... View Article
A current loop in a magnetic field: A. can be in equilibrium in one orientation. B. can be in equilibrium in two orientations; both the equilibrium states are unstable. C. can be in equilibrium in two orientations. One stable while the other is unstable. D. experiences a torque where the field is uniform or non-uniform in all orientations.
Answer: C. can be in equilibrium in two orientations. One stable while the other is unstable.
Use the appropriate conjunction to form a sentence: We reached home. At that moment, the phone rang.
No sooner did we reach home, than the phone rang
What is dry ice? Why it is called so?
Dry Ice is basically named to solid carbon dioxide (CO2). It is so called because it does not melt into... View Article
(i) Find two numbers in the ratio of 8: 7 such that when each is decreased by 12 , they are in the ratio 11: 9. (ii) The income of a man is increased in the ratio of 10: 11. If the increase in his income is Rs 600 per month, find his new income.
(i) Given, Ratio = 8: 7 Let us say, the numbers are 8x and 7x As per the given condition:... View Article
Define molecular formula.
The molecular formula is an expression that defines the number of atoms of each element in one molecule of a... View Article
The colour of light emitted by LED depends on: (a) Its reverse bias (b) The amount of forward current (c) Its forward bias (d) Type of semiconductor material
Answer: (d) Type of semiconductor material
Eddy currents are produced when: A. a metal is kept in varying magnetic field B. a metal is kept in a steady magnetic field C. a circular coil is placed in a magnetic field D. through a circular coil current is passed
Answer: A. a metal is kept in varying magnetic field
A body of mass m hits normally a rigid wall with velocity v and bounces back with the same velocity. The impulse experienced by the body is: A. 1.5Mv B. 2Mv C. zero D. Mv
Answer: B. 2Mv
The unit for electrochemical equivalent is:
The unit for electrochemical equivalent is gram per coulomb.
1 parsec = ____metres
1 parsec = 3.086 x 1016meters
Methanogenic bacteria are not found in: A. Rumen of cattle B. Gobar gas plant C. Bottom of water-logged paddy fields D. Activated sludge
Answer: D. Activated sludge
What is the density of water in SI units?
Density of water in SI units is 1000 kg per cubic meter.
The IUPAC name of cinnamaldehyde is: A. 2(E)−3−phenlyprop−2−enal B. 2(Z)−1−phenlyprop−1−enal C. 2(E)−1−phenlyprop−2−enal D. 2(E)−3−phenlyprop−1−enal
Answer: A. 2(E)−3−phenlyprop−2−enal
Casparian strips occurs in: (a)Pericycle (b)Endodermis (c)Epidermis (d)Cortex
Answer: (b)Endodermis
