Answer:
Explanation:
NOTE : Although, you have added 5 questions, I am here answering those, that I know the best. I hope it would be helpful to you. In case you have any query, please leave a comment, we will try our best to fix it. Thank you
Ans A
As the formula for speed = distance/time the correct answers here will be –
Time = distance/speed
Distance = Speed x Time
(e) Speed = distance/time
Ans B
The correct option is (D) since the lifetime of sun is 10.8 billion years. Thus, the time shown by you is very short.
As you have provided the units which is second here for time, option a, c and e are incorrect
Ans C
Density = Mass/Volume
As the slab is in cuboid shape, volume will be length x breadth x height
Thus, Mass = density x volume
Volume = 100 cm x 300 cm x 4 cm
2.75 x 100 x 300 x 4
The correct option is (E)
Option (b) is incorrect because unit for density is incorrect
Option a is incorrect due to incorrect formula. Thus option € is correct where the metre values are first converted into centimetre and proper formula is used.
