Sorting Material into Groups
This test is standardised achievment test in chemistry suitable for the students of cbse,icse and all other boards of class 6 and also useful for the students of different competitions and olympiads.
Questions
Cotton is soft because
- it is obtained from a plant
- it is opaque in nature
- it has no luster
- it is a bad conductor of heat
- it traps lot of air in it
Which of the following is soluble in water?
- Glycerin
- Sand
- Iron filings
- Chalk
- Kerosene
Ability of materials to return to its original shape when a force is removed is known as ___________.
- plasticity
- elasticity
- hardness
- absorbency
- waterproof
What will happen if petrol is mixed with water and stirred?
- Crystals of petrol will form.
- Petrol will form a separate layer below the water.
- Petrol will form a separate layer on the surface of water.
- Petrol and water form a single layer.
- Water and petrol together will make a thick solution.
Aerated water (soft drinks) contains ___________.
- nitrogen
- methane
- carbon di oxide
- helium
- argon
Most balloons, tyres and footballs are made of rubber. This is because rubber is
- naturally available
- cheap
- an electrical insulator
- soft and flexible
- light weight
A needle and a knife both belong to the same group because
- they are transparent
- they are hard and magnetic
- they float on water
- they are poor conductors of heat
- they are poor conductors of heat
A vendor sells white powdered salt mixed with powdered stone. The knowledge of which property will help you detect this malpractice?
- Opacity
- Texture
- Density
- Solubility
- Magnetic property
Paper bags are preferred over plastic because
- plastic bags are light
- paper bags are stronger
- plastic bags are not bio-degradable
- paper bags are not biodegradable
- paper bags are not transparent
Door locks are made of metals because metals
- have lustre
- are opaque
- are insoluble in water
- are hard and strong
- are naturally available
Why does 1 kg of iron occupy less space as compared to 1 kg sponge?
- Iron has less density than sponge.
- Iron has more density than sponge.
- Iron is hard but sponge is soft.
- Iron has magnetic property but sponge has not.
- Iron has lustre but sponge has not.
Why do chalk pieces first float on water, but after sometime sink?
- Chalk is white in color.
- Chalk is a metal.
- Chalk in soluble in water.
- Chalk is opaque.
- Chalk is porous.
Kerosene floats on water because
- kerosene has more density
- kerosene has less energy
- the density of water is more than kerosene
- water has more weight
- kerosene has a bad odour
Which of the following substance is in crystalline form?
- Coal
- Wax
- Sugar
- Clay
- Rubber
Metals can be drawn into thin wires. This property is called
- elasticity
- volatility
- ductility
- malleability
- solubility
Which of the following has reddish brown color?
- Gold
- Copper
- Iron
- Silver
- Zinc
By dropping some water on a glowing electric bulb, it bursts. This is because glass is a
- good conductor of heat
- bad conductor of heat
- transparent substance
- good conductor of electricity
- bad conductor of electricity
Which of the following is the most essential property of a substance to be used as a cooking vessel?
- Conductance of heat
- Ductility
- Conductance of electricity
- Malleability
- Elasticity
Overhead cables need not be insulated because
- bare wires shine brightly
- air is a good conductor of electricity
- bare wires conduct electricity better than insulated wires
- they are not dangerous due to height
- air is a bad conductor of electricity
Electric cables are made up of
- silver
- plastic
- copper
- lead
- rubber