1.
Which of the following parts of the sun is easily visible only during a total solar eclipse?
Answer: Option 'B'
corona
2.
Potassium Permanganate is used for purifying drinking water, because
Answer: Option 'D'
it is an oxidising agent
3.
What does airbag, used for safety of car driver, contain?
Answer: Option 'C'
Sodium azide
4.
In fireworks, the green flame is produced because of
Answer: Option 'C'
Barium
5.
As you go down into a well, your weight
Answer: Option 'C'
decreases slightly
6.
The weight of an object will be minimum when it is placed at?
Answer: Option 'D'
The weight of an object is minimum when it is placed at the center of the earth because when an object is in the center, it experiences gravitational pull from all directions.
7.
The blue colour of the clear sky is due to
Answer: Option 'C'
A clear cloudless day-time sky is blue because molecules in the air dissipate blue light from the sun more than they dissipate red light. When we look towards the sun at sunset, we see red and orange hues on the grounds because the blue light has been scattered out and away from the line of sight.
8.
Which one of the following types of waves are used in a night vision apparatus?
Answer: Option 'A'
Infra-red waves
9.
Which of the following is used in pencils?
Answer: Option 'A'
Graphite
10.
A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive, and O positive. The blood group of the adopted son is
Answer: Option 'A'
O positive
11.
When a gas is turned into a liquid, the process is called
Answer: Option 'D'
condensation
12.
If a tropical rain forest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because
Answer: Option 'A'
The soil of rain forest is deficient in nutrients
13.
At present, scientists can determine the arrangement or relative positions of genes of DNA sequences on a chromosome. How does this knowledge benefit us?
1. It is possible to know the pedigree of livestock.
2. It is possible to understand the causes of all human diseases.
3. It is possible to develop disease-resistant animal breeds.
Which of the statements given above is/are correct?
Answer: Option 'D'
1, 2 and 3
14.
Which of the following has got more heat capacity?
Answer: Option 'C'
Water
15.
The radioactive element most commonly detected in humans is
Answer: Option 'A'
potassium-40
16.
The gases used in different types of welding would include
Answer: Option 'B'
oxygen and acetylene
17.
What happens when some charge is placed on a soap bubble?
Answer: Option 'C'
Its radius increases
18.
The filament of an electric bulb is made of
Answer: Option 'C'
tungsten
19.
The uranium fuel used worldwide is mainly in the form of
Answer: Option 'B'
UO2
20.
Which of the following plants is not capable of manufacturing own food?
Answer: Option 'B'
Mushroom