Test: Light, Sound and Force - 1
10 Questions MCQ Test Science for Class 3 | Test: Light, Sound and Force - 1
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Sun, table lamp and torch are luminous objects as they give light of their own, Moon on the other hand is non-luminous object as it shines by reflecting sunlight.
Ritu cannot hear what Megha is saying, X must be ______.
Ritu cannot hear Megha, because sound waves made by Megha are not reaching Ritu through X. Sound waves can travel through solid, liquid and gas but not vacuum. Thus, X can be vacuum.
Sahil shone a torch and blew a horn at the same time, while standing at 15m distance from Amit. Amit will _______.
Sound waves travel slower than light waves thus, Amit will first see the light and then hear the sound.
X is a force that works in the opposite direction of movement of an object in contact with a surface. It is _____.
Friction is a force between the surface of movement and the moving object. It opposes motion and works in the opposite direction of movement.
Look at the picture and select the correct option regarding it.
The force of gravity applied by the Earth is acting on the book at this time.
The object shown here, does not cast a shadow. It is most likely made up of X material. X could be
Metal and ceramic are opaque materials, hence cast a shadow when light rays fall on them. Frosted glass is translucent hence it does not allow all light rays to pass through it hence, it also casts a light shadow. Transparent materials like clear plastic sheet allow all the light to pass through them and do not cast a shadow.
Select the odd one out on the basis of type of mechanical force involved.
Opening of refrigerator door, playing tug of war and taking out water from well using rope attached to bucket, require pull forces however hitting a cricket ball with a bat require push force.
Four boys rolled oil drums of the same weight and size up the ramps of different heights as shown here. Which one of them put the most effort?
The more the height of the ramp, the more is the effort required to roll up an oil drum.
The given diagram shows a fishing boat which sends out ultrasound waves that return after a few seconds. Select the correct statement regarding this.
Aman went to watch a football match. He wrote his experience on a picture card as shown here.
His father explained that it is the force applied on the football which causes it to _____.
A force is a push or a pull that can make a stationary object move, change the speed and direction of moving object and stop a moving object.
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