_____ 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... View Article
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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... 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... 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... 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... 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... 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... 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... 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... 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... 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... 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... 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... 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. Explanation Galvanometer – Used to measure electric current.... 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... View Article
What is the chemical formula of bauxite?
Answer: Bauxite is a form of sedimentary rock and is the principal source of the popular metal aluminium. The chemical... View Article
Give reason: Danger signals are red in colour
Answer: As the light travels through the atmosphere, tiny air particles scatter it. The dispersion of the light is inversely... View Article
Find the odd one out in the given options. (1) 145 (2) 197 (3) 325 (4) 399
Answer: (4) 399 Consider (1) 144 Let us consider 145 as 144 + 1 145 = 144 +1 145 = (12)2... 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
