Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1ccd2f59b460d7261edf4.PNG' />
From the above figure, supply the missing information for diagram.
Question 6 :
Express in standard form: Charge of an electron is 0.000,000,000,000,000,000,16 coulomb.
Question 8 :
If a = – 1, b = 2, then find the value of $a^b\div b^{a}$
Question 12 :
If a = – 1, b = 2, then find the value of $a^b\times b^{2}$
Question 16 :
Express in standard form: Size of a plant cell is 0.00001275 m
Question 19 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1ccd2f59b460d7261edf3.PNG' />
From the above figure, supply the missing information for diagram.
Question 23 :
The distance between the Sun and the Earth is $1.496\times10^8 km$ and distance between the Earth and the Moon is $3.84\times10^8$ m. During solar eclipse the Moon comes in between the Earth and the Sun. What is distance between the Moon and the Sun at that particular time?
Question 24 :
In a stack there are 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack.
Question 25 :
State true or false: Standard form is also called scientific notation form.
Question 26 :
In a stack there are 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?
Question 27 :
A particular star is at a distance of about $8.1\times10^{13}$ km from the Earth. Assuring that light travels at $3\times10^8$ m per second, find how long does light takes from that star to reach the Earth.
Question 42 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cccef59b460d7261edee.PNG' />
Refer to the above image. Determine whether there is a single repeater machine that will do the same work. If so, describe it.
Question 46 :
State true or false: For any non-zero integer a, $a^{(-m)} = 1/a^m$
Question 47 :
Find two repeater machines that will do the same work as a (× 81) machine.