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The most abundant metal in the earth’s crust is : (1) Iron (2) Nickel (3) Aluminium (4) Sodium

Answer: (4) In the earth crust, oxygen percentage is 46.6 but oxygen belongs to the non-metal group. The most abundant metals are 8.1% of... View Article

What is the full form of PVC?

Answer: The full form of PVC is polyvinyl chloride. PVC is made of vinyl chloride monomer by condensation polymerization and it is an example of... View Article

What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one example of each type.

Answer: In the formation of a covalent bond between two atoms, each atom will share one electron. The electrons present in the covalent bond... View Article

What is chyme?

Answer: In the stomach, food and water are mixed properly to form a slurry known as chyme. After this process, the food is ready to move into... View Article

Why ice is lighter than water?

Answer: The density of ice is less than liquid water so ice is lighter than water. A water molecule is made of one oxygen atom combined with... View Article

What is oxidation number of carbon in CN^-?

Answer: Let us consider the oxidation state of C in CN- is x. The oxidation number of N = -3 Sum of the oxidation number is the same as the... View Article

The extremely high melting point of diamond (carbon) may be explained by the (1) Network covalent bond (2) Ionic bond (3) Hydrogen bond (4) Van der waal’s forces

Answer: (1) Diamonds are the homogeneous, naturally-occurring, solid, and generally inorganic substance with definable chemical composition and... View Article

Agamospermy includes (1) Adventive polyembryony (2) Recurrent apomixis (3) Nonrecurrent apomixis (4) All the above

Answer: (4) Agamospermy asexual reproductive process in the place of normal sexual processes involving reduction division and fertilization.... View Article

Which one is correct for fuse wire ? (1) Low resistance and low melting point (2) High resistance and high melting point (3) High resistance and low melting point (4) Low resistance and high melting point

Answer: (3) The fuse wire in an electrical fuse is selected in such a way that it does not face any damage when the normally stipulated amount of... View Article

Write the chemical name for dry ice. Justify its name how its stored.

Answer: Dry ice is an example of sublimation which is a frozen form of carbon dioxide (CO2). Dry ice is a solid form of carbon dioxide. When... View Article

Pyramid of numbers is? (1) Always upright (2) Always inverted (3) Either upright or inverted (4) Neither upright nor inverted

Answer: (3) Pyramid of the number shows the number of species per trophic stage. The pyramid of numbers is usually upright except for some... View Article

Write the difference between Pectoral and Pelvic girdle.

Answer: The difference between the pectoral girdle and pelvic girdle are listed below. Pectoral girdle Pelvic girdle The shoulder... View Article

Ptyalin enzyme is secreted by (1) Salivary gland (2) Mouth (3) Oesophagus (4) Stomach

Answer: (1) Enzyme ptyalin is also known as salivary amylase which is present in the saliva of humans. Ptyalin gets activated by chloride ions... View Article

Find the smallest number which when increased by 17 is exactly divisible by both 520 and 468.

Answer: The given numbers are 520 and 468. Let us find the LCM of 520 and 468 The Least Common Multiple(LCM) is a method to find the... View Article

The working principle of spring balance is : (1) Newton’s law of motion (2) Hooke’s law (3) Ohm’s law (4) None of the above

Answer: (2) Spring balance is used to determine the force acting on the object (weight). Spring balance works on the principle of Hooke's law.... View Article

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