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Which of the following is/are polynomials? (a) 4xz^2 (b) 4xz^2 + 4xy (c) 2xy (d) All of the above are polynomials

Polynomial is made up of two terms, namely Poly (meaning “many”) and Nominal (meaning “terms.”). A polynomial is defined... View Article

A point performs simple harmonic oscillation of period T and the equation of motion is given by x = a sin(ωt + π/6). After the elapse of what fraction of the time period the velocity of the point will be equal to half of its maximum velocity? (a) T/3 (b) T/12 (c) T/8 (d) T/6

Given X = a sin (ωt + π/6) aω/2 = aω cos (ωt + π/6) 1/2 = cos (ωt + π/6) ωt = π/6... View Article

A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 seconds for every circular lap. The average velocity and average speed for each circular lap respectively is: (A) 0, 0 (B) 0, 10 m/s (C) 10 m/s, 10 m/s (D) 10 m/s, 0

Given Radius = 100 m Time interval = 62.8 seconds On a circular path in completing one turn, the distance travelled is 2πr while the... View Article

An assumption of the constant marginal utility of money means the importance of money to the consumer is ________. (a) rising (b) falling (c) unchanged (d) none of the above

An assumption of the constant marginal utility of money means the importance of money to the consumer is 'unchanged' Marginal utility of money... View Article

Two particle of equal mass m and charge q are placed at a distance of 16 cm. They donot experience any force. The value of q/m is:

Given: They do not experience any force, i.e, the net force = 0 Hence, We get, Hence, is the value of q/m... View Article

If mass of earth decreases by 25% and its radius increases by 50% then acceleration due to gravity at its surface decreases by nearly: (A) 89% (B) 67% (C) 33% (D) 11%

We know, The mass of the earth decreases by 25% remaining 75% of M = (75/100)M Radius of earth increases by 50% Hence, New radius = 150% of R =... View Article

A train is running at a speed of 40 km/hr and it crosses a post in 18 seconds. What is the length of the train? (A) 190 metres (B) 160 metres (C) 200 metres (D) 120 metres

Given Speed of a train, v = 40 km/hr v = 40000/3600 m/s v = 400/36 m/s Time taken to cross, t = 18 seconds Distance covered, d = vt d = (400/36)... View Article

The energy of a photon is given as 3.03 x 10^-19 J/atom. The wavelength of the photon is: (a) 6.56 nm (b) 65.6 nm (c) 0.656 nm (d) 656 nm

Given E = 3.03 x 10-19 J/atom As per the formula or where, h = 6.626 x 10-34 Js and c = 3 x 108 ms-1 On substituting all values, we get, We... View Article

Why are bulbs filled with chemically inactive Nitrogen or Argon gas? (A) To prevent oxidation of Tungsten filament (B) To prevent dehydration of Tungsten filament (C) To prevent oxidation of Steel filament (D) None

The filament in an electric bulb is made using tungsten which would burn quickly when it comes in contact with the oxygen in the air. This is the... View Article

Which of the following is the energy of a possible excited state of hydrogen? (A) +13.6 eV (B) -6.8 eV (C) -3.4 eV (D) +6.8 eV

In a hydrogen atom, the energies (in eV/atom) of electron in 1st, 2nd, 3rd, 4th and 5th energy levels are -13.6, -3.4, -1.51, -0.85 and -0.544... View Article

A cylindrical roller 2.5 m in length, 1.75 m in radius when rolled on a road was found to cover the area of 5500 m^2. How many revolutions did it make?

Given length of a cylindrical roller, h = 2.5 m radius of a cylindrical roller, r = 1.75 m Total area rolled on a road by a cylindrical roller... View Article

Silicon is an important constituent of (a) chlorophyll (b) haemoglobin (c) rocks (d) amalgams

Silicon is an important constituent of 'rocks'. Hence the correct option is (c) Learn more: Silicon... View Article

Hair cream is an example of (a) gel (b) sol (c) aerosol (d) emulsion

An emulsion can be defined as a colloid consisting of two or more non-homogenous type of liquids wherein one of the liquid contains the... View Article

Which is the main function of RBC? (a) To fight diseases in the body (b) To carry oxygen to different parts of the body (c) To increase levels of WBC (d) To arrest bleeding

The main function of RBC is to carry oxygen to different parts of the body. Hence, the correct option is (B) Learn more: RBC... View Article

What is oogenesis? Give a brief account of oogenesis

Oogenesis is the process of formation of female gametes. This process begins inside the fetus before birth. The steps in oogenesis up to the... View Article

Credit sales are recorded in a (A) Sales Book (B) Cash Book (C) Journal Book (D) Purchases Book

Credit sales are recorded in a 'sales book'. Sales journal is used for recording all the sales done on credit by the business. It is also known... View Article

Who is regarded as ‘the mother of the Indian Revolution’? (A) Rani Lakshmi Bai (B) Sarojini Naidu (C) Madame Cama (D) Priti Lata Wadderdar

Bhikaji Rustom Cama, also known as Madame Cama, is regarded as the 'Mother of the Indian Revolution'. She played a crucial role in the Indian... View Article

Write the symbols of Lead

In the modern periodic table, lead is represented by the symbol 'Pb'. Learn more: Lead... View Article

Explain the coordination isomerism and ionisation isomerism with examples

Coordination Isomerism In coordination isomerism, the interchange of ligands between cationic and anionic entities of different metal ions... View Article

Carbon monoxide is a pollutant because it (A) reacts with O₂ (B) reacts with hemoglobin (C) inhibits glycolysis (D) inactivates nervous system

Answer: (B) reacts with haemoglobin Carbon monoxide is a major pollutant in the air exhausted by various automobiles. Carbon monoxide combines... View Article