Explanation

Who is telling a lie is an interrogative sentence of Present Continuous Tense.

Who is telling a lie means کون جھوٹ بول رہا ہے

Who means کون

Tell a lie means جھوٹ بولنا

Present Continuous Tense

Active Voice: Subject + is/am/are + First of verb + ing + obect.

Passive Voice: Object + is being/am being/ are being + third form of verb + by + subject.

Explanation

The zeroth law of thermodynamics states that if two thermodynamic system are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

Explanation

A free-falling object has an acceleration of 9.8 m/s/s, downward 

Explanation

2 + 1 = 3

3 + 2 = 5

5 + 3 = 8

8 + 4 = 12

12 + 5 = 17

17 + 6 = 23

Explanation

"The branch of science concerned with the nature and properties of matter and energy.

The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."

Explanation

Because pollution control measures are expensive, many industries hesitate to adopt them.

Explanation

There are n cows: 
First son gets: 2n​

Second son gets: 4n​

Third son gets: 5n​

Fourth son gets: 7 cows

Therefore, sum of cows each son gets equals the total number of cows
2n​+4n​+5n​+7=n
7=20n​
n=140

Explanation

x + 5x + 10x = 640

16x = 640

x = 40

∴ no. of notes = 40×3=120

Explanation

Let A be the amount of type of first rice and

B be the Amount of second type of rice

According to question:  A + B = 50 Kg

Also

                           A  x 4.5 + B x 5 = 240 Rs

Thus solving the above two equations

                    (50 – B) x 4.5 + 5B = 240

                       225 – 4.5 B + 5B = 240

                                          0.5 B = 15

                                                 B = 15/ 0.5

                                                 B = 30 Kg

                                        Thus A = 50 – 30 = 20 Kg

Explanation

1163​=1619​  Its reciprocal=1916​
∴ Required difference=1619​−1916​
=304361−256​=304105​