National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 7

Three solutions of different substances P, Q and R gave the following results with different indicators.
Solution P : Turns methyl orange red.
Solution Q : Turns turmeric solution red.
Solution R : Turns phenolphthalein solution pink.
Identify the solutions P, Q and R respectively

AAntacid, soap solution, lemon juice
BBaking soda, shampoo, antacid
CLemon juice, sodium hydroxide, baking soda
DVinegar solution, antacid, lemon juice.


Post Your Answer

Subject :NSO    Class : Class 7

Observe the given experimental setup carefully.

Which of the following statements is/are correct?
1. The nails in flask I will rust because both water and oxygen are available.
2. Nails in flask II will not rust because tap water contains impurities.
3. Nails in flask III will not rust because both oxygen and water are not available.

A2 only
B1 and 3 only
C3 only
DNone of these


Answer should be C as it the nails are covered with calcium chloride which removes water vapour from air so statement 3 should be correct

Post Your Answer

Subject :NSO    Class : Class 7

Post Your Answer

Subject :NSO    Class : Class 7

Post Your Answer

Subject :NSO    Class : Class 6

Post Your Answer

Subject :NSO    Class : Class 6

Which of the following statements is false?

AMeasuring tape is not suitable to measure the girth of a tree.
BA suitable measuring device is must to measure the length of an object.
CIn ancient India, small length measurements used were an angul or a mutthi.
DElectric trains, monorail, supersonic aeroplanes and spacecrafts are some of the 20th century contributions.


I could not understand the solution to this question at all. Please give clearer and accurate solutions.

Post Your Answer

Subject :NSO    Class : Class 7

Post Your Answer

Subject :NSO    Class : Class 4

Post Your Answer

Subject :NSO    Class : Class 7

Rohan is going to school with his father by car. He decides to note the readings on the odometer of the car after every five minutes till he reaches the school. The given table shows the odometer readings of his journey.

Time (am) 7:30 7:35 7:40 7:45 7:50
Odometer
reading (km)
36593 36596 36599 36602 36605
If he left for school at 7:30 am, then find the average speed of the car.

A5 m/s
B6 m/s
C10 m/s
D15 m/s


e

Post Your Answer

Subject :NSO    Class : Class 7

The given figure shows steps involved in the process of wool yarn making. Identify steps a, b, c, d and e and select correct option regarding them:



A In many parts of the world, step 'a' is done once a year. It harms the sheep and is painful.
B Steps 'b and c' show the process of scouring, during which workers are at high risk of getting respiratory diseases.
C Step 'd' converts wool fleece into narrow untwisted fibres called slivers.
D Step 'e' depends on the length of the fibres. Long fibres are used for making tweeds and flannel whereas short fibres are used in making gabardines.


Post Your Answer