Why ice is lighter than water?
Answer: The density of ice is less than liquid water so ice is lighter than water. Water molecule A water... View Article
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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... 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 an orderly internal... 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. Apomixis is... 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... 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... 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... 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 girdle... 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... 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. LCM of 520 and 468 Let us find the LCM of 520... 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... View Article
What is joint diastole?
Answer: When all the four chambers of the heart are in a relaxed state it is known as joint diastole.... View Article
Which main product is obtained by microbial fermentation as ethanol?
Answer: A process of microbial fermentation in which sugar is converted to ethanol is known as ethanol fermentation or alcoholic... View Article
Difference between periodic and non-periodic motion
Answer: The motion is characterized as the change in position of an object with respect to its surroundings in a... View Article
What are phanerogams?
Answer: Phanerogams are plants that have special structures for reproduction and generate seeds. In these plants, after the process of... View Article
State two differences between Heat Capacity and Specific Heat Capacity.
Answer: The difference between the specif heat capacity and heat capacity is listed below. Specific heat capacity Heat capacity Specific... View Article
Explain with suitable examples, the different types of phyllotaxy.
Answer: The patterns of arrangement of leaves on the stem are called Phyllotaxy. There are three types of Phyllotaxy, alternate, opposite... View Article
Metals are good conductors of heat because: (1) They contain large number of free electrons (2) Their aloms are relatively apart (3) Their atoms collide frequently (4) They have reflecting surface
Answer: (1) Metals are an excellent electricity and heat conductor because the metal atoms form a matrix through which the... View Article
Identify the set of homeothermic animals. (1) Frog, lion and fish (2) Bat, pigeon and rabbit (3) Pigeon, lizard and Tortoise (4) Rat, snake and crocodile
Answer: (3) Explanation Homeotherms are organisms that can only survive when their internal body temperature is kept within a certain... View Article
Calculate the volume occupied by one molecule of water? (Given density 1 g cm-3)
Answer: Given Density of water (ρ) = 1g/cm3 Molar mass of water (M) = 18 g/mol ∴ Molar volume (Vm)... View Article
