Questions

Q:

Indian-American girl won 2017 Young Scientist Challenge for water contamination detection device. What is her name ?

A) Kavita Kumari B) Gitanjali Rao
C) Hetal Rao D) Savita Sharma
 
Answer & Explanation Answer: B) Gitanjali Rao

Explanation:

Gitanjali Rao, an 11-year-old Indian-American schoolgirl, was named as "America’s top young scientist" for inventing a cost-effective, quick lead-contamination detector in water. The seventh-grade student was inspired by the large-scale lead contamination in water in Flint, Michigan, that came to light recently.

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Q:

Which of the following processes includes all others?

A) diffusion of a solute across a membrane B) passive transport
C) osmosis D) facilitated diffusion
 
Answer & Explanation Answer: B) passive transport

Explanation:

Passive transport Process includes all other process like facilitated diffusion, osmosis and diffusion of a solute across a membrane.

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Q:

Dust particles in the air of large industrial cities are removed by 

A) Sedimentation B) Electrophoresis
C) Tyndall effect D) Brownian movement
 
Answer & Explanation Answer: B) Electrophoresis

Explanation:

Dust particles such as coal dust(smoke) are fine particle of a solid (carbon in the case of smoke) dispersed in air. They are colloidal systems and the particles are charged either positive or negative. In an applied electrical field, they are attracted towards the opposite electrodes. Movement of the particles towards the electrodes is known as 'electrophoresis'. Hence electrophoresis is applied to remove smoke within the chimeny itself without allowing it to escape into the air and cause nuisance.

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Q:

How many pints of blood in the human body?

A) 6 - 8 B) 10 - 12
C) 8 - 10 D) 5 - 7
 
Answer & Explanation Answer: B) 10 - 12

Explanation:

Scientists estimate the volume of blood in a human body to be approximately 7 percent of body weight. An average adult body with a weight of 150 to 180 pounds will contain approximately 4.7 to 5.5 liters of blood. An average child with a body weight of 80 pounds will have approximately half the amount of blood as an adult.

The amount of blood in a human body varies, depending on factors such as age, sex, overall health and even where a person lives. For example, men tend to have more blood than women of comparable size and weight.

Interestingly, people who live at high altitudes may have up to two liters of extra blood compared to those who live at lower altitudes. Because the air at higher altitudes has less oxygen, people who live at high altitudes need extra blood to deliver the right amount of oxygen to their lungs.

 

We know that 1 Pint = 0.473 liters

 

Hence, an average amount of blood in the human body = 4.7 - 5.5 lit = 10 - 12 pints.

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Q:

Who was the first Indian woman who owns the gold medal in Asian Games?

A) P.T.Usha B) Sunita Rani
C) Shiny Abraham D) Kamaljit Sandhu
 
Answer & Explanation Answer: D) Kamaljit Sandhu

Explanation:
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Q:

Which of the following is an example of continous emission spectrum?

A) Spectrum of an oil frame B) Spectrum of a water
C) both D) none
 
Answer & Explanation Answer: A) Spectrum of an oil frame

Explanation:

Spectrum of an oil frame is an example for continuous emission spectrum

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Q:

Circuit breaker usually operate under

A) after D. C. component has ceased B) transient state of short-circuit current
C) sub-transient state of short-circuit current D) steady state of short-circuit current
 
Answer & Explanation Answer: B) transient state of short-circuit current

Explanation:
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Q:

Vision can be affected by drugs and alcohol making, especially difficult to distinguish

A) Light B) Colors
C) Distance D) Shapes
 
Answer & Explanation Answer: B) Colors

Explanation:

Drinking alcohol can cause many damages to your body. Your vision can be affected as you will face blurred and double vision and even you can't identify colors.

alcohol_drinking_effects1531827596.jpg image

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