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WorksheetsASSET PRACTICE
Total questions: 28
Worksheet time: 14mins
A regular telephone neither uses batteries, nor is it connected to the electric supply. From where does it get the energy (electricity) required for its working?
It does not require any energy for its working.
It gets energy through the regular telephone wires.
It gets energy every time someone speaks into it.
It gets energy every time someone dials a number.
Srihari has a torch with him and 2 new batteries. However, the torch requires 3 batteries to work. Is there any way Srihari can get the torch to glow?
In the working of which of these is air resistance desirable and important?
superfast trains
parachutes
pendulums
fighter aeroplanes
Here is the picture of an aircraft, with the forces working on it shown.
Identify the force that corresponds to the question mark.
Buoyancy
Atmospheric pressure
Gravity
Density
While repairing a fan, a trainee electrician connects the wires wrongly. When the fan is switched on, it rotates at the proper speed, but in the OPPOSITE direction. What will happen as a result of this?
The fan will work for sometime and then stop.
The fan will consume more power.
The fan will not throw down any air.
The fan will work perfectly.
Electrical fires cannot be safely put out by dousing them with water. However, fire extinguishers that spray carbon dioxide on the fire work very effectively because it forms a blanket around the burning material.
But these carbon dioxide extinguishers cannot be used for wood fires. Why?
The carbon dioxide blanket itself acts as a fuel and starts burning along with the wood.
The extinguished wood can retain enough heat inside the carbon dioxide blanket to re-ignite when the gas dissipates.
In the presence of carbon dioxide from the extinguisher, the burning wood reacts with oxygen to release heat and make the fire worse.
Carbon dioxide reacts with wood to give carbon and oxygen; the oxygen makes the fire worse and the carbon burns along with the wood.
In which of these cases is there no ROTATIONAL MOTION?
operating a pulley
hitting a shuttlecock
riding a bicycle
using a beam balance
During a power cut, lights, fans, televisions and other electrical devices stop functioning, but most telephones continue to work. Why is that?
Telephones do not use electricity.
All telephones have cells (batteries) inside which provide them power.
Telephones receive electric supply through the wires connecting them to the exchange.
Telephones store the electricity when there is no power cut and use them during power cuts.
Sonika is working with the circuit shown in the figure. The circuit has two gaps - X and Y. She has wires of five different materials - I, II, III, IV and V. She knows that the bulb will light up only when both gaps are filled with conducting materials.
She records her observations in a table. After completing the experiment, ink fell on the paper and she lost entries in row 3. Based on the rest of the information in the table, what could be the materials in row 3?
I and III
II and III
III and IV
IV and V
In the solar panel shown here, one form of energy is converted into another. An example of a device in which the energy conversion is OPPOSITE to that of the solar panel is_____________.
a candle
a radio
a tube light
a steam engine
An energy form NOT commonly used in households is__________.
chemical
nuclear
heat
electrical
Nuclear power plants can produce energy more cheaply and with less pollution than thermal power plants. Why are there not more nuclear power plants than thermal power plants?
There is an endless supply of fossil fuels like coal available.
Nuclear fuels produce too little heat during the nuclear fission reaction
A kilogram of fossil fuel produces more energy than a kilogram of nuclear fuel.
The issue of disposal of radioactive nuclear waste is not satisfactorily resolved.
A torch uses three different forms of energy. Which of these shows the energy changes in the correct order?
Mechanical---------> Heat---------> Chemical
Heat---------->Chemical--------->Light
Electrical----------> Mechanical-----------> Chemical
Chemical-------------> Electrical--------------------> Light
Calorie is a unit of energy. Some food items mention on their label a certain number of calories. What is the reason for this?
Food is used to measure energy.
The calorie figure indicates how much energy the food would give when eaten.
The calorie figure indicates how much energy was used to make the food item.
Food items having more than a certain number of calories are banned.
What is the source of energy in a calculator having solar cells?
heat energy
light energy
wind energy
chemical energy
John's bedroom windows shake when crackers are burst near his house. Which of these scientific facts explains why this happens?
Sound waves transmit energy.
Heat waves transmit energy.
Light waves transmit energy.
Radio waves transmit energy.
When we take a picture at night with a flash camera, which of these is the ENERGY CONVERSION that takes place?
Chemical------------->Light
Light---------------->Sound
Mechanical-------------->Light
There is no energy conversion
What energy conversion takes place when a TV is switched on for a long period of time?
Electrical energy to light and sound energy only.
Electrical energy to light, heat and sound energy.
Electrical energy to mechanical energy only.
Electrical energy to light energy only.
A boy picks up a catapult, places a stone in it and fires the stone. Which of these provides energy to the stone to fly?
No energy is needed for the stone to fly.
Energy stored in the stone itself.
Energy stored in the catapult's wooden frame.
The food eaten by the boy earlier.
Which of the following living things uses the energy from sunlight to make its own food?
the bee
the water lily
the jelly fish
the grasshopper
Water can be made to boil above its normal boiling point of 100o Celsius by_______________.
increasing the quantity of water being boiled
boiling the water in a tightly closed container
heating the water on low flame in a wide vessel
boiling the water at a high altitude, like in the hills
Which of these is the most suitable way to find out if iron or copper is a better conductor of heat?
The diagram below shows a block of wood stuck in a metal container.
Which of these is the best way to remove the block
of wood undamaged?
Burn the wood.
Drill holes in the metal container
Submerge the container in water.
Heat the metal container.
When heated candle wax changes from a solid into a liquid. The molecules______________.
absorb heat and move apart
absorb heat and come together
release heat and move apart
release heat and come together
Plants produce glucose from carbon dioxide and water during photosynthesis. Glucose and its derivatives are the building materials of plants.
From where does the majority of the bulk of a tree come?
the soil
the air
the minerals + chlorophyll
the water + minerals
You must have played with gas balloons that keep rising higher and higher in the air. Why do these gas balloons rise?
The balloon is made of a special material whose density is less than air's.
The balloon is filled with a gas less dense than air.
The balloon is filled with a gas colder than air.
The thread of the balloon is made of a special material.
Which type of pollution is caused by bursting a lot of crackers during Diwali?
Water pollution
Air and sound pollution
Light and sound pollution
Only sound pollution
Adhrija loosened the string of a fully blown balloon and placed it on the floor. It moved backwards and came to a halt. What could have caused the balloon to move backwards
The air above the balloon caused it to move backwards.
The air rushing out of the balloon pushed it in the backward direction.
The air from outside, entered the balloon and pushed it in the backward direction.
The balloon became small when the air in it came out, so it was blown by the wind.
