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Voluntary muscles are found in (1) Alimentary canal (2) Limbs (3) Iris of the eye (4) Bronchi of lungs

Answer: (2) Skeletal muscle or voluntary muscles is one of the three types of muscles in the human body- the others being visceral and cardiac... View Article

What do you understand by the term ‘auto-protolysis’ of water? What is its significance?

Answer: A self ionization of water molecules takes place to produce hydronium ion and hydroxide ion are known as auto-pyrolysis of water. 2H2O... View Article

Blister copper is : (1) Electrically refined copper (2) A mixture of impure copper and silver (3) Copper containing 2% impurity (4) Present in the anode mud in an electrolytic process

Answer: (1) Copper is usually mined from its coal by smelting process known as blister copper. It is about 98 to 99 per cent pure.... View Article

Why is atomic mass of chlorine taken as 35.5 u and not a whole number like 35 u or 36 u? Explain.

Answer: The reason for the atomic mass of chlorine taken as 35.5u and not as 35u because of the presence of isotopes. Isotopes are defined as... View Article

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 Circumference of the cylinder = 132 cm (i)... 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 around for a long... 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. Acids are ionic compounds... 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 to... 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 hydrocarbons,... View Article

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

Answer: Effective atomic number (EAN) in a complex is defined as the total number of electrons present around the central metal ion. EAN =... 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 and... 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+) and the alpha... 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 compound splits... 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 in milk... 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 total surface area of a cube = 6 × (side)2... 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 the molecule which are connected... 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. The... View Article

Connective tissue with a fluid matrix is (1) Ligament (2) Tendons (3) Blood (4) Cartilage

Answer:(3) Connective tissues imply support and connect different tissues and organs of the body. They are widely distributed in every part of... View Article

Write the IUPAC name of CH3 – CH2 – CH2 – CH=CH2.

Answer: The IUPAC name of CH3 - CH2 - CH2 - CH=CH2 is Pent-1-ene. A single chemical compound can have several acceptable systematic names and... View Article

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