National Science Olympiad Forum By SOF Olympiad Trainer - Page 11

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
B

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 6

During the science activity, Ms. Rakhee conducted the following experiments :
Experiment I : 10 g of rock crystals of common salt were dissolved in 50 mL of water at °.
Experiment II : 30 g of finely powdered common salt was dissolved in 50 mL of water at 60°C.
Experiment III : 10 g of rock crystals of common salt were dissolved in 100 mL of water at °.
Experiment IV : 10 g of finely powdered common salt was dissolved in 100 mL of water at 60°C.
In which experiment common salt took the shortest time to dissolve ?

AExperiment I
BExperiment II
CExperiment III
DExperiment IV


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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 6

Let ball P and ball Q both released from point O of their respective frictionless ramps as shown in the given figure. The time taken by both the balls to reach point O′ is recorded. If both the balls have travelled the same distance, then which of the following statements is/are correct about the time taken by the two balls?

I. Ball P takes a longer time than ball Q.
II. Ball Q takes a longer time than ball P.
III. Both the balls P and Q take the same time.
IV. Cannot be determined as the masses of both the balls are not given.

AI only
BII only
CIII only
DI, II, III and IV


If in the question frictionless ramp is mentioned then why does the explanation include friction change according to inclination of ramp?

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Subject :NSO    Class : Class 10

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Subject :NSO    Class : Class 10

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Subject :NSO    Class : Class 9

Read the given statements and select the correct option.
Statement 1 : Work done against friction in moving a body over a closed path is zero.
Statement 2 : Work done by a constant force is always zero in a round trip of the point of application of force.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is false but statement 2 is true.
D Both statements 1 and 2 are false.


Answer should be c as work done by any conservative forces in a closed loop is ALWAYS zero.

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