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What are the factors affecting the height of the waves?

The factors affecting the height of the waves are the Speed of the Wind, earthquakes, Volcanic eruptions and Underwater landslides.... View Article

Define angle of prism?

The angle formed due to two lateral faces of the prism is known as the angle of prism. The two lateral faces are from where the light enters... View Article

A mirror forms a virtual image of a real object: (A) it must be a convex mirror. (B) it must be concave mirror. (C) it must be a plane mirror. (D) it may be plane or convex mirror

Answer: (D) it may be plane or convex mirror... View Article

The mass of an physical object is:

The mass of a physical object is the amount of matter in an object. It does not change at any time. Learn more: Mass and Weight... View Article

From a cliff of 49m high, a man drops a stone. One second later, he throws another stone. They both hit the ground at the same time. Find out the speed with which he threw the second stone.

For first stone h = 49 m g = 9.8 m/s2 t = 0 u = 0 We know that, h = ut + gt2/2 On substituting, we get, 49 = 0 + 9.8t2/2 We get, t2 =... View Article

5 difference between clinical and laboratory thermometer

The differences between clinical and laboratory thermometer are as follows: Clinical thermometer (a) Temperature range is 350 to 420C (b) Used to... View Article

The dimension formula of thermal conductivity K given relation , Q = K

Thermal conductivity is defined as the transportation of energy due to the random movement of molecules across the temperature gradient. In... View Article

Aluminium crystallises in a cubic closepacked structure. Its metallic radius is 125 pm. (i) What is the length of the side of the unit cell? (ii) How many unit cells are there in 1.00 cm3 of aluminium?

Given, Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm. (i) Length of the side of unit cell for cubic... View Article

Which among the following is the smallest unit of length? A. Micron. B. Fermi. C. Angstrom. D. Nanometre.

Answer: B. Fermi. 1Fm = 10– 15m... View Article

Volume of gas at STP is 1.12 ×10^-7cc .Find number of molecule in it.

Given, Volume of gas at STP = 1.12 ×10-7cc One mole of gas occupies 22400 ml of volume Avogadro number, NA = 6.023×1023... View Article

Force can be measured in:

Force can be measured in Newton (N) ir Kgm/s2. Force is equal to the product of mass of the body and acceleration. F = ma Also,... View Article

One nanometre is equal to what?

1 nanometer is equal to 10 raised to the power -9 in meters. 1nm = 10-9 m... View Article

What is the biggest unit of length? (A) Kilometer (B) Hectometer (C) Decameter (D) Decimeter

Answer: (A) 1 Kilometer... View Article

Derive the formula P = VI of electric power

Power is equal to rate of change of electrical potential energy. P = dU/dt U = V.dQ P = d(V.dQ)/dt P = V.dQ/dt .....(1) As we... View Article

The temperature coefficient of resistance of a semiconductor? A. Is always positive B. Is always negative C. Is zero D. May be positive or negative or zero

Answer: B. Is always negative The temperature coefficient of resistance of a semiconductor is always negative. The temperature coefficient... View Article

How much water a pump of 2kW can raise in one minute to a height of 10 m. Take g = 10 m/s2?

Answer: Given, Power of the motor pump = 2 kW = 2000 W Time (t)= 60 sec Height (h) = 10 m g = 10 m/s2 As we know, Power (P) =... View Article

Factorize : a⁶ – b⁶ (a) (b – a) (a + b) (a³ + ab + b³) (a² – ab + b²) (b) (a – b) (a + b) (a² + ab + b²) (a² – ab + b²) (c) (a + b) (a + b) (a² + ab + b²) (2a² – ab + b²) (d) (a + b) (a – b) (a² + ab + b² (a³ – ab + b³)

Given a6 - b6 This can be written as below = (a2)3 - (b2)3 Using the formula: (a3 - b3) = (a - b) (a2 + ab + b2) = (a2 - b2) [(a2)2 + a2b2 +... View Article

Using the formula, tan 2A = 2 tan A / 1 – tan²A, find the value of tan 60⁰, it being given that tan 30⁰ = 1/√3

Put A = 300 2A = 600 tan 600 = 2 tan 300 / (1 - tan2 300) Given tan 300 = 1/√3 = (2 x 1/√3)/{1 - (1/√3)2} = (2 x 1/√3) /... View Article

Check whether the given equation is quadratic equation x² – 2x = (-2)(3-x)

Given x2 - 2x = (-2) (3 - x) By using the formula for (a+b)2 = a2 + 2ab + b2 ⇒ x2 - 2x = -6 + 2x We get, ⇒ x2 - 4x + 6 = 0 Since, the... View Article

At a cricket test match 2/7 of the spectators were in a covered place while 15000 were in open. Find the total number of spectators

Given Fraction of spectators covered = 2/7 Fraction left = 1 - 2/7 We get, = 5/7 Number of spectators in open = 15000 As per the question, Number... View Article

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