MEDIUM
4th CBSE
IMPORTANT
Earn 100
Ritesh wants to make a list of actions that show that friction produces heat. Which of the following actions can he include in his list?
(i) Rubbing hands together.
(ii) Scratching a match stick against the matchbox.
(iii) Sawing wood.
(iv) Drilling a hole into a metal sheet.
(v) Rubbing off some pencil marks with an eraser.
50% studentsanswered this correctly
Important Questions on National Science Olympiad (NSO) Questions
MEDIUM
4th CBSE
IMPORTANT
Three uniform planks, P, Q and R are balanced on pivots. Two equal forces, each of value F, act on each plank but in different manners as shown in the figure. 
Which of the following options is correct regarding this?
MEDIUM
4th CBSE
IMPORTANT
The girl 'a' is putting more efforts to pull the sack bag as compared to the girl 'b'. Girl 'a' has to work against a force which also _____.
MEDIUM
4th CBSE
IMPORTANT
Mayank wants to separate a mixture of salt-water-sand. Which of these separation methods should he use to separate all the three components?
EASY
4th CBSE
IMPORTANT
Which of the following processes increases the amount of water vapour in the atmosphere?
MEDIUM
4th CBSE
IMPORTANT
Why are the days on different planets of a different time period?
MEDIUM
4th CBSE
IMPORTANT
_____ is an imaginary line that runs from the North Pole to the South Pole. It is tilted at an angle of degrees.
MEDIUM
4th CBSE
IMPORTANT
Refer to the given picture which shows our solar system and select the correct option.
MEDIUM
4th CBSE
IMPORTANT
Which of the following statements is correct?
