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Showing: Class 7 (354 questions)

by Y.JESSICA GEONA RAJ · Class 7

Assertion (A): Sugar dissolves faster in hot water. Reason (R): Heating increases the speed of water particles.

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by Y.JESSICA GEONA RAJ · Class 7

Which of the following is an example of sublimation seen in daily life?

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by Y.JESSICA GEONA RAJ · Class 7

Ravi added 10 g sugar to 100 mL water. It dissolved fully. He added more sugar until no more could dissolve. The point at which no more sugar dissolves is called:

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by Y.JESSICA GEONA RAJ · Class 7

A piece of metal sinks in water but floats in mercury. This shows that:

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by Y.JESSICA GEONA RAJ · Class 7

A stone is placed in water. The water level increases. This is because:

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by Y.JESSICA GEONA RAJ · Class 7

When 10g of salt is completely dissolved in 100g of water, the resulting salt solution will have a mass of:

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by Y.JESSICA GEONA RAJ · Class 7

Which of the following mixtures is best separated by filtration?

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by Y.JESSICA GEONA RAJ · Class 7

The point at which no more sugar dissolves is called:

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by Y.JESSICA GEONA RAJ · Class 7

A student pours oil into a glass of water and notices that the oil forms a separate layer. This means oil and water are:

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by Y.JESSICA GEONA RAJ · Class 7

A solid is placed in a beaker of water and it sinks. What can be concluded about the solid?

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by Y.JESSICA GEONA RAJ · Class 7

Assertion: When we look into the mirror, we see our own face inside the mirror Reason: Mirror is made of a transparent substance that allows light to pass through it.

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by Y.JESSICA GEONA RAJ · Class 7

Assertion: Never ever look directly at the sun that could be extremely harmful for eyes. Reason: Pinhole camera can be used to see very bright objects.

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by Y.JESSICA GEONA RAJ · Class 7

Bouncing back of light from shining surfaces is called

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by Y.JESSICA GEONA RAJ · Class 7

Which types of objects do not allow light to pass through them?

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by Y.JESSICA GEONA RAJ · Class 7

Light travels in:

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by Y.JESSICA GEONA RAJ · Class 7

Assertion (A): A force can change the shape of an object. Reason (R): When force is applied, only the mass changes, not the shape.

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by Y.JESSICA GEONA RAJ · Class 7

Assertion (A): In first-class levers, increasing the effort arm makes lifting easier. Reason (R): A longer effort arm requires less force to lift the same load.

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by Y.JESSICA GEONA RAJ · Class 7

Which part of the scissors acts as the fulcrum?

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by Y.JESSICA GEONA RAJ · Class 7

If the effort arm is longer than the load arm in a first-class lever, what happens?

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by Y.JESSICA GEONA RAJ · Class 7

In a seesaw, what happens when the fulcrum is moved closer to the heavier child?

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