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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

What is ex situ conservation? Give example.

Answer: It is the process of conserving all the living species in the artificial habitats that imitate their natural habitats. Ex-situ... View Article

Write the principle behind the froth floatation process. What is the role of collectors in this process?

Answer: Flotation is the process of separation of beneficial minerals from a mixture by creating froth on which minerals separate out. The... View Article

All vertebrates are chordates but all chordates are not vertebrates. Justify the statement.

Answer: Phylum Chordata belongs to the Kingdom Animalia and includes all the vertebrates (animals with a backbone) and several invertebrates... 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 sin rule (a/sin A) = (b/sin B) = (c/sin C) ⇒ a = 4... View Article

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