Solve below rebus puzzle?

The current time can be represented by below textual rebus.

0
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B.Sc
LLB

Can you tell us the current time?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.

97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.

73 students studied all the three branches.

Can you find out the total number of students?

What 5-letter word typed in all capital letters can be read the same upside down?

Find out the missing number in the picture attached:

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?