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Adjacent sides of a parallelogram are equal and one of diagonals is equal to any one of the sides of this parallelogram. Show that its diagonals are in the ratio square root of 3 :1.

Answer: Here ABCD is a parallelogram. The Opposite sides of the parallelogram ABCD are equal. GIven parameters AB = DC and AB = BC Now AB... View Article

What is a solenoid? Draw a diagram with a solenoid connected in a circuit. How can you increase the strength of a solenoid?

A solenoid is a long piece of wire which is covered in the shape of a coil. When the electric current passes through the coil it generates a... View Article

Refractive index of glass with respect to water is (9/8) .Refractive index of glass with respect to air is (3/2) . Find the refractive index of water with respect to air.

Answer: Refractive index is defined as the ratio of the speed of light in a vacuum to its speed in a specific medium. Let us consider Refractive... View Article

What is the floral formula of a Malvaceae family?

Answer: The number of epicalyxes in the Malvaceae family is 3-8, the calyx has 5 gamosepalous sepals, the corolla has 5 polypetalous petals,... View Article

In which directions does the sun rise and set?

Answer: In the East, the Sun rises and sets in the West. This is because of our planet's rotation as the Earth spins eastward direction.... View Article

Bb roy of great britain has a very good wife What is this?

Answer: BB ROY of Great Britain has a very good wife which signifies the BBROYGBVGW alphabets. This is the electronic colour code that displays... View Article

Name one metal and one non-metal that exist in liquid state at room temperature.

Answer: Metals and non-metals are different kinds of materials that exist surrounding us. Elements can be classified into metals and nonmetals... View Article

Tundu disease of wheat is due to infection caused by (1) Nematodes and fungi (2) Fungi and bacteria (3) Nematodes and bacteria (4) A;gea and fungi

Answer: (2) Tundu disease is also known as yellow ear rot disorder. It is caused by nematodes and bacteria. The combined action of nematode,... View Article

The total surface area of hollow cylinder, which is open from both sides, is 3575 cm 2; area of the base ring is 357.5 cm 2 and height is 14 cm. Find the thickness of the cylinder.

Answer: Given parameters Total surface area of cylinder = 3575 cm2Area of the base ring = 357.5 cm2Height = 14 cm Let us consider The inner... View Article

Which one is component of ornithine cycle (1) Ornithine , citrulline and alanine (2) Ornithine , citrulline and arginine (3) Amino acid are not used (4) Ornithine , citrulline and fumaric acid

Answer: (2) The urea cycle is also known as the Ornithine cycle, it is a biochemical reaction which results in the formation of urea from... View Article

Deficiency of Molybdenum causes whip tail disease of cauliflower. (1) True (2) False

Answer: (1) cauliflower deformation due to the lack of molybdenum is named as whiptail disorder. Symptoms Disordered leaves with reduced area of... View Article

The speed of light in water and glass is 2.2×10⁸ m/s and 2×10^⁸ m/s ,respectively. What is the refractive index of glass with respect to water? (1) 1 (2) 1.1 (3) 0.909 (4) 0.8

The correct answer is (2) 1.1 Given parameters Speed of light in a water medium (v1) = 2.2×108m/s Speed of light in glass medium (v2) =... View Article

Define relaxation time of the free electrons drifting in a conductor? How is it related to the drift velocity of free electrons? Use this relation to deduce the expression for the electrical resistivity of the material.

Answer: Relaxation time is the time gap between two successive electron collisions in a conductor. The relationship between the relaxation... View Article

ABCD is a trapezium in which AB parallel DC and its diagonals intersect each other at point O . show that AO/BO = CO/DO

Answer: Given parameters ABCD is a trapezium where AB || DC and diagonals AC and BD intersect at O. To prove Construction Draw a line... View Article

What is the S.I. unit of electric potential? (1) Ampere (2) Volt (3) Volt.m (4) Coulomb

Answer: (2) The S.I. Unit of Electric potential is volt. Electric potential energy is a scalar quantity and is defined as the total potential... View Article

Define food chain. How many types of food chain are there ? Give difference between food chain and food web. Draw a linear diagram of the food chain.

Answer: A food chain refers to the order of events in an ecosystem, where one living organism eats another organism, and later that organism is... View Article

How can ethanol and ethanoic acid be differentiated on the basis of their physical and chemical properties?

Answer: The difference between ethanol and ethanol and ethanoic acid depending on their physical and chemical properties are given below in the... View Article

Why do we apply paint on iron articles?

Answer: Rusting of iron is a redox reaction. When iron is exposed to the environmental condition it terribly reacts with water and air and... View Article

An organic compound ‘A’ produces a gas with brisk effervescence when sodium bicarbonate is added to it. The compound ‘A’ contains the same number of carbons as in ethane. The compound ‘A’ reacts with ethanol to form a sweet smelling compound ‘C’ in presence of conc. H2SO4 acid. Then the name of compound A and the gas evolved is (1) Ethanoic acid ; CO2 (2) Methanoic acid ; CO2 (3) Ethanoic acid ; H2 (4) Methanoic acid ; H2

Answer: (1) The compound A contains the same number of carbon as ethane. Number of carbon atom in A compound = 2 When sodium bicarbonate is added... View Article

Briefly explain the structure of pollen grains.

Answer: Pollen grains are microscopic structures varying in size and structure. Some of them are tiny spheres while others are egg-shaped.... View Article

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