Explanation

When the velocity-time graph is a straight line parallel to the time axis then its acceleration is zero.

This is because velocity is constant w.r.t time ie., the change in velocity is zero.

Hence, the acceleration is also zero.

Explanation

Given:

Initial efficiency (η₁) = 50% = 0.5

Initial cold body temperature (T₁) = 17°C = 290 K

Initial hot body temperature (T₂) = unknown

We know that the efficiency of a Carnot engine is:

η = 1 - (T₁ / T₂)

0.5 = 1 - (290 K / T₂)

T₂ = 580 K

Now, the hot body temperature is increased by 145°C:

New hot body temperature (T₂') = 580 K + 145°C = 725 K

New efficiency (η₂) is:

η₂ = 1 - (T₁ / T₂')

= 1 - (290 K / 725 K)

≈ 0.6

New efficiency (η₂) is approximately 60%.

Explanation

The passive sentence "Her face is being washed by Huma" is converted to the active voice as "Huma is washing her face".

It indicating the subject (Huma) is performing the action.

Explanation

Dog, Cow, and Tiger are mammals — they are warm-blooded, have fur/hair, and give birth to live young (most of the time).

Snake is a reptile — it is cold-blooded, has scales, and lays eggs.

So, Dog, Cow, and Tiger are more alike, and Snake is the odd one out.

Explanation

51, 64, 121, 144, 256

Check if they are perfect squares:

- 51 → Not a perfect square  

- 64 → 8²  

- 121 → 11²  

- 144 → 12²  

- 256 → 16²  

All are perfect squares except 51.

Explanation

The odd one out is 13545

Because it is the only number in the list that is odd,

While 17458, 13762, 29498, and 27993 are all even numbers. 

Even Numbers: Numbers that are divisible by 2 (end in 0, 2, 4, 6, or 8).

Odd Numbers: Numbers that are not divisible by 2 (end in 1, 3, 5, 7, or 9)

Explanation

January    31

July            31

March         31

February    28

Explanation

Blue, Red ,Green are primary colours

While yellow is secondary colour obtained by mixing two primary colours.

Explanation

The winters are generally very cold here. 

Refers to winters in this specific place, as a known fact.

Explanation

hot is burn

similarly cold is to freeze