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The circumference of the base of a cylindrical vessel is 132 cm and its height is 25 cm (use ?= 22/7) . Find the (i) Radius of the cylinder (ii) Volume of cylinder

Answer: Let us consider The radius of the cylinder = r Height of the cylinder = h = 25 cm... View Article

Describe the structure of HIV with diagram.

Answer: HIV originated in non-human primates and eventually spread to humans over the aeons. Even though the disease had been... View Article

What do all acids and bases have in common?

Answer: Before letting know the common properties between acid and a base, let us know their definitions first. Definition Acids... View Article

With the help of a block diagram, explain the operation of FM superheterodyne receivers.

Answer: The superheterodyne Receiver Block Diagram is illustrated below. Signals come from the antenna into the receiver and are transferred... View Article

Petro-crops are plants (1) Grown near oil fields (2) Used in refining crude oil (3) Whose fossil remains formed crude oil (4) From which petrol like fuels can be derived

Answer: (4) Petro-crops are the plants that produce petroleum compound as a supplement to petrol. Some plants or algae produce... View Article

What is effective atomic number ? Calculate effective atomic number of copper (Z=29) in [Cu (NH3) 4]2+

Answer: EAN rule Effective atomic number (EAN) in a complex is defined as the total number of electrons present around... View Article

…………is an exotic breed of cow. (1) Gir (2) Sindhi (3) Sahiwal (4) Jersy

Answer: (4) Crossbreeding is achieved using exotic breeds. Exotic means foreigners are not indigenous. Somewhere an exotic is being produced... View Article

How would you name the following compounds? (i) CH3 – CH2 – Br (ii) H – CHO (ii) CH3 – (CH2) 3 – CH = CH2 (1) (i) Bromomethane (ii) Methanol (iii) Hexene (2) (i) Bromoethane (ii) Ethanol (iii) Hexene (3) (i) Bromopropane (ii) Methanol (iii) Hexene (4) (i) Bromoethane (ii) Methanal (iii) Hexene

Answer: (4) (i) Bromoethane (ii) Methanal (iii) Hexene A single chemical compound can have several acceptable systematic names and the... View Article

The specific charge of a proton is 9.6* 10^7Ckg^-1. Then calculate the specific charge of an alpha particle?

Answer: Given The specific charge of photon = 9.6 × 107Ckg−1 An alpha particle is doubly ionised helium nuclei (He2+)... View Article

When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide, and oxygen2Pb (NO?) ? ? 2PbO + 4NO? + O?The reaction is an example of (1) Combination reaction (2) Decomposition reaction (3) Double decomposition reaction (4) Displacement reaction

Answer: A decomposition reaction can be defined as a type of chemical reaction in which under suitable conditions, one single... View Article

Distinguish between renin and rennin.

Answer: The difference between renin and rennin is given below. Rennin Renin Rennin is a proteolytic enzyme which is useful... View Article

A lateral surface area of cube is 256m2. Find its volume?

Answer: Given The lateral surface area of cube = 256m2 Let us consider a = Side of the cube The... View Article

What would be the electron dot structure of carbon dioxide which has formula CO₂?

Answer: Electron dot structures or Lewis dot formula – It defines the nature of bond and position of atoms of... View Article

Draw a well labelled diagram showing the alimentary canal of cockroach and label any four parts. What is meant by paurometabolous development in cockroach?

Answer: Cockroaches belong to the category of insects of the Blattodea order. Around 4,600 cockroaches are living aside human habitats.... View Article

In a triangle ABC, sinA : sinB : sinC = 1 : 2 : 3. If b = 4 cm, then the perimeter of the triangle is (1) 6 cm (2) 24 cm (3) 12 cm (4) 8cm

Answer: (3) Given parameters: sinA = 1 sinB = 2 sinC = 3 b = 4 cm According to the... View Article

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