HOTs for Science Olympiad -6 - Class 4 MCQ

When clouds become very cold, water vapour condenses to form ice crystals instead of water drops.
I. In which form water will fall down? II. Which statement best describes this condition?

Look at this picture of a mixture of sugar and water.

​A student uses a hot plate to separate a mixture of water and sugar. Which physical property allows this to occur?

Ananya’s father was suffering from constipation. He visited the doctor. The doctor advised him to take a good amount of water and to include a good amount of roughage in his diet.
I. What is roughage?
II. Why did the doctor recommend to include roughage in his diet?
III. How many glasses of water should a healthy adult consume?
IV. What are the sources of roughage?

Select the correct match:

This diagram shows a light bulb. The bottom of the light bulb is shaped so that the bulb fits securely into a light socket.
I. Which type of simple machine is the bottom of the bulb?
II. What is the shape of a filament in the light bulb?

I. The process shown below would be classified as:

II.What would happen on a rainy day?
 A. Precipitation      The precipitation rate would increase
B. Condensation     The condensation rate would decrease
C. Transpiration      The transpiration rate would increase
D. Evaporation         The evaporation rate would decrease 

The given figure shows the structure of a tooth. Select the correct option for the parts labelled P, Q, and R.

What are the functions of the nervous system?

I. In the figure, number 3 signifies?
II. In the figure, number 2 signifies?

​Deepak, Anjali, Shikha, and Shobhit were talking about the reason behind the shorter and colder days in winter.
1. Deepak: The earth is spinning slower during this time.
2. Anjali: The moon is causing fewer rays to get to the earth.
3. Shobhit: The earth is tilted away from the sun and the sun’s rays strike the earth less directly.
4. Shikha: There are more clouds covering the earth and blocking the sun.
Choose the correct answer:

​When comparing fossil A to fossil B, which is most likely correct?

Two students designed an experiment to study soil erosion. A steady stream of water flows from a faucet into a tray holding sand and gravel. The water forms a channel by eroding some of the sand and gravel. How can the students increase the amount of sand and gravel being eroded?

Your mom is cooking a pot of spaghetti on the stove. You observe that the spaghetti moves all around the pot even though she is not stirring. What makes the spaghetti move?

Which graph represents an object that is decreasing in speed?

The diagram below shows a simple food web.

 I. Which animal is classified  as an omnivore?
II.  How many herbivores are there in the chain?
III. Which animal is at the top of the food pyramid if you make a food pyramid from the    given  food chain?
IV.    How many food pyramids can you make from the given food chain?.

The picture below shows a place where air currents will form due to the uneven heating of the earth. In which direction will the air currents most likely move?

I. The moon maintains its orbit around the earth as a result of?
II. What is the difference between the gravitational force of the Earth and the Moon?

I. Which of these makes a sound with the slowest vibration?
II. Which sound waves create noise?