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_________ enables us to see things.
_______ have their own light.
Which star is closest to the earth?
Sun is the main source of ______ and heat.
Many man-made objects like a bulb, a diya and _______ also give out light.
The objects that give out light are called __________.
Which heavenly body shines but does not have its own light?
The objects that do not give out light are called _________.
The non-luminous objects are visible only when _______ falls on them.
Light travels in a __________.
Water can travel in a _______ path.
What is formed when an object blocks the path of light?
When we block the light of the sun from falling on the ground, we can see our ________.
Outdoor shadows are longer at _________ and ________.
The outdoor shadows are shortest at _______.
The colour of a shadow is always _________.
We hear _______ all around us.
The sound made by a dog is called _________.
The sound made by a cat is called _________.
The birds _______.
A bell makes ________ sound.
We produce ______ when we speak, sing, laugh, etc.
We talk very _______ when we play Chinese whisper.
A drum makes ________ sound.
The sounds of birds chirping, soft music, etc, makes us ________.
The sounds which make us happy are ________ to hear.
The sounds of loud music, honking of horns, etc, makes us _________.
The sounds which annoy us are ________ to hear.
Unpleasant sounds are called ______.
Noise ________ people.
Too much noise can damage our ______.
We should speak ________.
We should avoid too much ______ of vehicles.
We should keep the ______ of radios and televisions low.
What do we do to open a drawer of the table?
What do we do to close a drawer in the table?
The push or pull action is called _______.
When we pull a trolley it starts ______.
When we pull or push a chair, its ________ changes.
When a goalkeeper catches the ball, it ________.
When a ball is kicked or thrown, it changes the __________.
When we pull or push clay dough, its _______ changes.
The force can do ______ things.
Which of these is a non-luminous object?
Which of these is a luminous object?
A refrigerator is a _____ object.
A bird makes ______ sound.
We apply _______ to push a car.
A donkey _______ in a loud sound.
A table lamp is a _______ object.
Firecrackers make _______ sound.
Sounds are of _______ types.
Noise can be reduced by avoiding ______ sounds.
Firefly is a ________ animal.
The duck makes a ______ sound.
The frog makes a _____ sound.
The snake makes a ______ sound.
The ________ are not allowed to be used in public places, after a certain time at night.