Archives

How are microwaves produced ? Why is it necessary in microwave ovens to select the frequency of microwaves to match the resonant frequency of water molecules?

Microwaves are generated by vacuum tubes devices that operate on the ballistic motion of electrons controlled by magnetic or electric fields.... View Article

Newspaper:Editor::Film:……? a) Producer b) Actor c) Director d) Make-up artist

Option c) Director. Newspaper is prepared by editor and film is directed by director.... View Article

At a place where the acceleration due to gravity is 10 m sec−2 a force of 5 kg-wt acts on a body of mass 10 kg initially at rest. The velocity of the body after 4 second is:

We know g=10 m/s2, F=5 kg-wt=50 N, M=10 kg, Initial velocity u=0Acceleration a = F/M = 50/10 = 5m/s<sup>2</sup>v=u+atv=0+5(4) = 20 m/s... View Article

Choose the correct abstract noun form of the adjective mentioned in quotes. The plants “grow” well when there is sunlight and water. Their ________ depends on the presence of these two elements. a) Growing b) Grew c) Growth d) None of the option

Option c) Growth. The abstract noun form of the verb grow is growth.... View Article

When phenol is treated with chcl3 and NaOH the product is a) Salicylaldehyde b) Benzoic acid c) Benzaldehyde d) Salicyclic acid

Option a) Salicylaldehyde. When phenol is treated with chloroform and NaOH, salicylaldehyde is obtained.... View Article

The horizontal and vertical lines in a line graph are usually called ————- and —————

X-axis and Y-axis.... View Article

The female mosquito is not considered a parasite although it needs our blood for reproduction. Explain.

The female mosquito is not considered as a parasite because it needs blood for reproduction and not for nutrition. It needs human blood to... View Article

State whether given statement is true or false : heat from the sun reaches us by the process of convection

False. Heat from the sun reaches us by the process of radiation.... View Article

Covalent compounds are soluble in a) Polar solvents b) Non-Polar solvents c) Neither Polar nor Non-polar solvents d) Both Polar nor Non-polar solvents

Option b) Non-Polar solvents.... View Article

The reaction of metal with metal salt solution proceed via which type of reaction mechanism a) oxidation reaction b) Combustion reaction c) Double displacement d) Metal displacement

Option d) Metal displacement. In a metal displacement reaction, a more reactive metal can displace a less reactive metal from its salt solution.... View Article

Elaborate indirect democracy give names of any four countries where it exists

Indirect democracy is also known as representative democracy. It is the political system where representatives act on the behalf of the citizens... View Article

Purification of aluminium by electrolytic refining is known as————– a) Serpeck’s process b) Hall’s process c) Hoope’s process d) Baeyer’s process

Option c) Hoope's process. Purification of aluminium by electrolytic refining is called Hoope's process.... View Article

Which of the following oxides is acidic in nature?

(A) SiO2 (B) Ga2O3 (C) Al2O3 (D) As2O3 The Correct Answer is (A) SiO2 Solution: Silicon dioxide (SiO2) is an acidic oxide. It will react... View Article

How many dimensions a solid has

Solid has 3 dimensions, characterized by length, breadth, and height. Example: Cube, Cuboid and Cone.... View Article

Solid NaCl is a bad conductor of electricity because a) in solid NaCl, there are no electrons b) in solid NaCl, ions cannot move freely c) in solid-state, there are no ions d) none of the above

Option b) in solid NaCl, ions cannot move freely. A substance can only conduct electricity if it contains charged particles that are free to move... View Article

During inhalation the diaphragm a) Contracts and does not flatten b) Do not contract c) Contracts and flattens d) Expands

Option c) Contracts and flattens. During the process of inhalation, the diaphragm contracts and flattens, and enlarges the chest cavity. This... View Article

In vitro clonal propagation in plants is characterized by a) Electrophoresis and HPLC b) Microscopy c) Northern blotting d) PCR and RAPD

Option d) PCR and RAPD. Random amplified polymorphic DNA (RAPD) is a Polymerase Chain Reaction (PCR) based technique that is widely used for... View Article

M	T	W	T	F	S	S
			1	2	3	4
5	6	7	8	9	10	11
12	13	14	15	16	17	18
19	20	21	22	23	24	25
26	27	28	29	30	31