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Which of the following statement(s) about saliva is/are true?
Identify X and Y in the given Venn diagram and select the correct option.
Crude oil is purified using fractional distillation process. This method is based on:
When the temperature of the solid is increased, the energy of the particles increases.
What is one common property among the following phenomena?
1. the rotation of blades of a fan
2. the blinking of traffic lights
3. the swinging of a pendulum
Shiva covered one of the leaves of his green plant shown below with a piece of black pastel paper. He then kept the plant in a dark place for 2 days.
After 2 days of darkness, he kept the plant in a bright sunny place for a day. At the end of the day, Shiva conducted an iodine test on the leaf.
Q. Which one of the diagrams below shows the result of the test?
Mary made the following statements about photosynthesis.Which of the statements is/are INCORRECT?
When a drill bores a hole in a piece of wood, it demonstrates:
Two identical metal balls A and B moving in opposite directions hit each other at points X as shown in the figure. Changes are most likely to appear in their:
In case of collision, changes are most likely to be appear in the speed and direction of both the balls.
Adam shone a beam of light from a torch at two objects, X and Y, as shown in the diagram below.
The shadow formed by object X was much lighter than the one formed by object Y.
Q. Which of the following materials are X and Y likely to be made of?
A plane mirror reflects a pencil of light to form a real image. Then the pencil of light incident on the mirror is:
Kara performed an experiment. She positioned a tennis ball between a screen and a torch as shown below.
She wrote down the steps she followed:
1. Switch on the torch.
2. Measure the height of the shadow of the tennis ball formed on the screen.
3. Move the tennis ball 5 cm closer to the torch.
4. Measure the height of the shadow again.
5. Repeat steps (3) and (4) twice, moving the tennis ball 5 cm closer to the torch each time.
Q. Which of the following states the correct hypothesis for the above experiment?
Sameer’s torch does not light up. This could be because of the following reason:
The diagram below shows what happens when two objects, X and Y, are placed very close to each other on a piece of paper laced with iron fillings.
Q. Which one of the following statement(s) is/are definitely true?
1. Object X is a magnet
2. Object X is made of copper
3. Object Y is made of non-magnetic material
4. Object Y is made of magnetic material
Which of the following groups of items is needed to make an electromagnet?
Four nails of different materials – iron, steel, copper, aluminum – were stroked with a magnet. Which of them will turn into a magnet?
Set-ups A and B below are placed on a table in the science room.
Q. What are the similarities that can be observed in both set-ups after 45 minutes?
Which of the following situations show(s) that heat is lost?
1. When ice melts
2. When water vapour condenses
3. When water changes to ice
4. When a steel pot is left in the fridge
Early in the morning, Ryan observed that there were water droplets on the outside of cars, even though it did not rain the night before.
Q. What is the correct explanation for Ryan observation?
Read the following statement about diseases.
1. They are caused by germs
2. They are caused due to lack of nutrients in our diet
3. They can be passed on to another person through contact
4. They can be prevented by taking a balanced diet
Q. Which pair of statements best describes a deficiency disease?