** **Practice Question and Answer

8## Q: If the population of a town is 12.000 and the population increases at the rate of 10% per annum, then find the population. after 3 years.

506 06426e27c72ca731a990e28e2

6426e27c72ca731a990e28e2- 115,972true
- 212,200false
- 311,200false
- 410,200false

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## Answer : 1. "15,972"

Explanation :

To find the population after 3 years given that it increases at a rate of 10% per annum, you can use the formula for exponential growth:

𝑃=𝑃0×(1+𝑟)𝑛P=P0×(1+r)n

Where:

- 𝑃P = Population after 𝑛n years
- 𝑃0P0 = Initial population
- 𝑟r = Rate of increase (in decimal form)
- 𝑛n = Number of years

Given:

- 𝑃0=12,000P0=12,000 (Initial population)
- 𝑟=0.10r=0.10 (10% increase per annum)
- 𝑛=3n=3 (Number of years)

Substitute these values into the formula:

𝑃=12,000×(1+0.10)3P=12,000×(1+0.10)3

𝑃=12,000×(1.10)3P=12,000×(1.10)3

𝑃=12,000×(1.331)P=12,000×(1.331)

𝑃=15,972P=15,972

So, the population after 3 years would be approximately 15,972.

## Q: Which of these metals is found in liquid state?

650 061275cd493f02206607eb0af

61275cd493f02206607eb0af- 1Ironfalse
- 2Mercurytrue
- 3Silverfalse
- 4Othersfalse

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## Answer : 2. "Mercury"

Explanation :

Mercury is the only metal that is liquid at normal temperatures.

## Q: The producers formed by the combustion of magnesium are -

879 061275bc7dbe92e068b9111ff

61275bc7dbe92e068b9111ff- 1is acidicfalse
- 2is indifferentfalse
- 3alkalinetrue
- 4allfalse

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## Answer : 3. "alkaline"

Explanation :

Therefore, the correct option is (C) Magnesium ribbon on burning in air produces: 'Magnesium oxide, heat and light'.

## Q: Which metal can be cut with a knife among sodium, lithium, calcium and nickel?

724 061275c2293f02206607ea973

61275c2293f02206607ea973- 1Sodiumtrue
- 2Lithiumfalse
- 3calciumfalse
- 4allfalse

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## Answer : 1. "Sodium"

Explanation :

Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. The freshly cut surface is a shiny, silver colour, but this tarnishes quickly to a dull grey as the metal reacts with oxygen and water in the air.

## Q: Which of the following is a disease caused by bacteria?

685 060363803e62cee435672f5ba

60363803e62cee435672f5ba- 1Titanustrue
- 2Malariafalse
- 3Poliomyelitisfalse
- 4Filariafalse

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## Answer : 1. "Titanus"

Explanation :

All of these diseases are caused by bacteria i.e. Pneumonia, Cholera, Tuberculosis. Cancer is caused by uncontrolled cell division. Pneumonia is caused by a bacterium Streptococcus pneumoniae. Cholera is caused by a bacterium Vibrio cholerae.

## Q: The Prime Minister of England at the time of the Quit India Movement was?

670 063ef4b4eb0030e718d836ed2

63ef4b4eb0030e718d836ed2- 1Chamberlainfalse
- 2McDonaldfalse
- 3Churchilltrue
- 4Clement Attleefalse

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## Answer : 3. "Churchill"

Explanation :

Mounting pressure from China and the United States, as well as from the Labour Party in Britain, led Prime Minister Winston Churchill to send Stafford Cripps to India to discuss the Draft Declaration, as settled by the War Cabinet and its Committee between 28 February to 9 March 1942, containing proposals to resolve ...

## Q: Which of the following hitting methods has the highest power factor?

1605 05ef417b67c1ec61320b5a6c6

5ef417b67c1ec61320b5a6c6- 1heating resistancetrue
- 2induction heatingfalse
- 3Arc heatingfalse
- 4Dielectric heatingfalse

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## Answer : 1. "heating resistance"

Explanation :

The correct answer is Resistance Heating. Resistance heating is based on the I2R effect and is highly resistive in nature that's why it has the maximum power factor. Electric resistance heating is defined as “the heat produced by passing an electric current through a material that preferably has high resistance”.

## Q: Which football player has won the FIFA World Player Award (FIFA Ballon d’or) for four years in a row?

1066 060ab40001615d94344783e05

60ab40001615d94344783e05- 1Andres Iniestafalse
- 2Christiane Ronaldofalse
- 3Lionel Mesaitrue
- 4Michel Platinifalse

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## Answer : 3. "Lionel Mesai "

Explanation :

The correct answer is Lionel Messi. Lionel Messi won the FIFA Ballon d'Or award for the fourth time in a row in January 2013. Messi's fourth award lifted him above three-time FIFA winners Zinedine Zidane of France and Brazil's Ronaldo.