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_____ is called father of genetics (1) Mendel (2) Hook (3) Virchow (4) Strasburger

Answer: (1) Gregor Mendel is known as the Father of Genetics. He experimented on pea plants and discovered the basic inheritance rules. The three... View Article

Terylene is a polymer obtained from (1) Ethylene glycole and glycerol (2) Ethylene glycole and glyceraldehyde (3) Ethylene glycole and terephthalic acid (4) None of the above

Answer: (3) Ethylene glycol and terephthalic acid undergo condensation reaction to produce Terylene. The other name of Terylene is synthetic fibre.... View Article

Differentiate between combustible and non combustible substance with properties

Answer: Between a fuel and an oxidant, combustion is a high-temperature exothermic redox chemical reaction. This oxidant is usually oxygen from... View Article

Every rational number is a whole number? true or false , also give reason of your answer

Answer: False A rational number is any number that can be expressed as a fraction. Whereas, a whole number is a positive number without a... View Article

Which pathogen causes Tikka disease of groundnut? (1) Cercospora personate (2) Pyricularia oryzae (3) Xanthomonas citri (4) Tungrovirus

Answer: (1) Tikka disease of groundnut also known as Leaf spot disease is a disorder. The causal organism of tikka disease is the organism of the... View Article

What happens when the egg is not fertilised?

Answer: The female gamete is the egg in the female uterus's ovaries, which unites with male sperm to form a zygote. The zygote is fertilised... View Article

In parasitic food chain, the pyramid of numbers is (1) Upright (2) Inverted (3) Linear (4) Both A and B

Answer: (2) Pyramid of the number shows the number of species per trophic stage. The pyramid of numbers is inverted in the parasitic food chain.... View Article

Define one atomic mass unit (a.m.u.) .

Answer: An atomic unit of mass is defined as accurately 1/12 the mass of a carbon-12 atom. The carbon-12 atom has six neutrons and six protons... View Article

If the mass of an electron is 9 × 10⁻²⁸ grams. Calculate the weight of one mole of electron?

Answer: A mole can be defined as a unit or measure containing the same number of atoms or molecules. One mole of atoms or molecules has... View Article

Speed of light in air is 3×10⁸ m/s and speed of light in common glass is 2×10^8 m/s.Calculate the refractive index of glass.

Answer: The glass refractive index is defined as the ratio between the speed of light in the vacuum and the speed of light in the glass. The... View Article

What is meant by power of a lens? Write its SI unit. A student uses a lens of focal length 40 cm and another of −20 cm. Write the nature and power of the lens.

Answer: Power of lens is known as the inverse of the focal length of the lens measured in meter(m). S.I unit of power = Dioptre (D) Power of... View Article

State two ways to prevent the rusting of iron

Answer: Rusting of iron refers to the formation of rust, a mixture of iron oxides, on the surface of iron objects or structures. This rust is... View Article

What happen when dilute hydrochloric acid is added to iron filling?

Answer: The single displacement reaction occurs when dilute hydrochloric acid is introduced to iron feelings. The iron displaces hydrogen from... View Article

A hypothetical reaction A₂ + B₂ → 2AB follows the mechanism as given below: A₂ ⇌ A + A (fast) A + B₂ → AB + B (slow) A + B → AB (fast) The order of the overall reaction is: (1) 2 (2) 1 (3) 1.5 (4) 0

Answer: (3) Since (A) is the intermediate reactive substance whose concentration is determined from the equilibrium step. Let us consider the... View Article

Which instrument is used to measure depth of ocean ? (1) Galvanometer (2) Fluxmeter (3) Endoscope (4) Fathometer

Answer: (4) Fathometer - Used to measure the depth of the ocean. Galvanometer - Used to measure electric current. Fluxmeter - Used to... View Article

Washing Soda is the common name for (1) Calcium carbonate (2) Magnesium carbonate (3) Sodium carbonate (4) Potassium carbonate

Answer: (3) Washing soda is a chemical compound which can be used to remove stains from the laundry and is an important ingredient for powder,... View Article

Cyathium and hypanthodium inflorescence are related in having (1) Nectar glands (2) Unisexual flower (3) Both (1) and (2) (4) None of these

Answer: (2) The inflorescence is the arrangement of flowers on the floral axis. Cyathium contains a cup-shaped involucre provided with... View Article

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