Explanation

Silicon is a metalloid with properties ideal for controlling electrical current.

It's the most widely used material in semiconductor devices like transistors and chips.

Explanation

The sentence is a hypothetical conditional (second conditional), which uses "were" for situations contrary to reality.

"If it were more humid in the deserts, the hot temperature would be unbearable" is grammatically correct in this context.

Explanation

In space, beyond Earth's atmosphere, the sky actually looks black because there is no air to scatter sunlight.

The blue color we see from Earth is due to Rayleigh scattering in the atmosphere, not the actual color of the sky.

Explanation

Looking at the pattern:

20 → 20 (no change)

20 → 19 (decrease by 1)

19 → 16 (decrease by 3)

16 → 17 (increase by 1)

17 → 13 (decrease by 4)

13 → 14 (increase by 1)

14 → 11 (decrease by 3)

Now, we continue the alternating pattern:

11 → 12 (increase by 1)

12 → 9 (decrease by 3)

The next two numbers are 10, 10.

Explanation

During photosynthesis, plants use water (H2O) along with carbon dioxide (CO2) to produce glucose and oxygen.

The oxygen released comes specifically from the water molecule.

Being split apart to provide the oxygen atoms needed for the glucose molecule. 

Explanation

The animal that uses echolocation for movement is the bat. 

Bats use high-frequency sound waves to navigate

And find food in the dark by emitting sounds

And then listening to the echoes that bounce back off objects. 

Explanation

Let's compare the fractions:

• 1/2​=0.5

• 4/5​=0.8

• 5/8​=0.625

Clearly,

4/5​>5​/8>1/2​

Correct answer: (B) 4/5

Explanation

The correct word to replace "aboriginal" in this context is "Primitive".

Explanation

 Iran launched monkeys into space in 2013, specifically in January and December.

The first monkey, named Fargam, was launched in January

And the second one was launched in December. 

Explanation

Total people = 100

Pepsi drinkers = 50

Coke drinkers = 40

Both = 20

People drinking Pepsi or Coke = Pepsi + Coke - Both

= 50 + 40 - 20

= 70

People drinking neither = Total - People drinking Pepsi or Coke

= 100 - 70

= 30