Science Term 2 - Test Paper 1
Question :
Rusting can be prevented by:
Options :
Option 1 :Heating the iron article
Option 2 :Storing the iron article in the soil
Option 3 :Storing the iron article in the almirah
Option 4 :Painting the iron article
Solution :
Rusting can be prevented by painting the iron article. This will stop the contact of the article with air and moisture present in the air.
Question :
A soft iron bar is introduced inside a current carrying coil. The magnetic field inside the coil:
Options :
Option 1 :Will decrease
Option 2 :Will remain unaffected
Option 3 :Will become zero
Option 4 :Will increase
Solution :
A soft iron bar is introduced inside a current carrying coil. The magnetic field inside the coil will increase.
Question :
The shown symbol for the battery has how many cells?
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Options :
Option 1 :2
Option 2 :3
Option 3 :1
Option 4 :4
Solution :
It has four pairs of long and short parallel lines, therefore it has four cells.
Question :
A fuse should have :
Options :
Option 1 :High melting point and high resistance
Option 2 :Low melting point and high resistance
Option 3 :High melting point and Low resistance
Option 4 :Low melting point and low resistance
Solution :
A fuse should have low melting point and low resistance.
Question :
The electromagnets are also used to separate which kind of material from the junk?
Options :
Option 1 :Plastic material
Option 2 :Electric material
Option 3 :Glass material
Option 4 :Magnetic material
Solution :
The electromagnets are also used to separate magnetic material from the junk.
Question :
What will you observe in a compass needle shown in the figure when the switch is moved to ON position?
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Options :
Option 1 :It shows deflection towards the right and then towards left
Option 2 :It shows deflection and then comes back to its original position
Option 3 :It does not show any deflection
Option 4 :It shows deflection and retains it till the current is switched OFF.
Solution :
When the switch is moved to ON position, the current flows through the circuit and hence a magnetic field is produced near it due to which the needle shows deflection and retains this deflection as long as current passes through the coil. Once the current is switched off it comes back to its original position.
Question :
Some pins are place near the end of the nail shown in the circuit diagram. Now the current is switched on for some time and then switched off. What will happen?
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Options :
Option 1 :The pins do not cling to the tip of the nail.
Option 2 :The pins get repelled by the tip of the nail.
Option 3 :As the current is switched on the pins cling to the tip of the nail and remain clanged even after the current is switched off.
Option 4 :As the current is switched on the pins cling to the tip of the nail but when it is switched off, the pins drop back.
Solution :
When current is passed through the wire wound on the nail, the nail behaves as electromagnet and attracts the pins. As soon as current supply is cut off the nail no longer behaves as an electromagnet and the pins are no longer attracted by it.
Question :
An electric bulb is used for light but it also gives heat. This is not desirable. This results in the wastage of electricity. This wastage can be reduced by using :
Options :
Option 1 :Light emitting diodes (LEDs)
Option 2 :Fluorescent tube lights
Option 3 :White tube lights
Option 4 :Compact fluorescent lamps
Solution :
Compact fluorescent lamps (CFLs) reduce wastage of electricity and can be fixed in the ordinary bulb holders.
Question :
Which of the following is a physical change?
Options :
Option 1 :Sharpening a pencil
Option 2 :Tearing paper
Option 3 :Handpicking
Option 4 :All the above
Solution :
Physical changes are reversible changes in the physical properties of substances. No new substances are formed in these changes.
Question :
Select the process/es associated with chemical change.
Options :
Option 1 :Formation of new products
Option 2 :Release of heat and light
Option 3 :Change in colour
Option 4 :All the above
Solution :
In addition to new products, the following may accompany a chemical change - emitting or absorbing heat, light or any other radiation, producing sound, change in smell may take place or a new smell may be given off, colour change may take place or gas may be formed.
Question :
Marine and coastal environmental pollution is due to:
Options :
Option 1 :Salts
Option 2 :Detergents
Option 3 :Fertilizers
Option 4 :Oil based products
Solution :
Oil based products
Question :
Why is vegetative propagation so called?
Solution :
In vegetative propagation, new plants are produced from roots, stems, leaves and buds. Since this asexual reproduction is through the vegetative parts of the plant, it is known as vegetative propagation.
Question :
What is the function of the parts marked A, D and E in the below figure?
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Solution :
A - Pulmonary vein, which carries oxygen rich blood from lungs to heart.
D – Vein, which carries blood (usually carbon-dioxide rich) from all parts of the body back to the heart.
E – Capillaries. These are thin tubes which exchange gases with the tissues and join to form veins
Question :
The mechanism that cools the plants is:
Options :
Solution :
Transpiration keeps the plants cool.
Question :
Coconut have___________ outer coat.
Options :
Solution :
Coconut have fibrous outer coat.
Question :
The water found below the water table is called:
Options :
Solution :
The water found below the water table is called groundwater.
Question :
What divides the left and right chambers of the heart?
Options :
Solution :
Septum divides the left and right chambers of the heart.
Question :
Why are ships painted?
Solution :
Ships are made of iron that can rust when in contact with water. Ships are painted to avoid rusting of iron
Question :
When a chemical change takes place what changes accompany the formation of new substance?
Solution :
In addition to new product the following may accompany a chemical change:
(i)Heat, light or any other radiation may be given off or absorbed.
(ii)Sound may be produced.
(iii)A change in smell may take place or a new smell may be given off.
(iv)A colour change may take place.
(v)A gas may be formed.
Question :
What are the causes of short circuiting and overloading?
Solution :
The short circuiting is due to the excessive flowing of current through the electric circuit which tears off the insulation. Overloading may be due to the flow of excessive current when many devices are connected to single socket.
Question :
The letter F is placed in front of a plane mirror. How would its image look like when seen in a mirror?
Solution :
The image would appear as:
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