Font size
WorksheetsCH- 1, 10
Total questions: 35
Worksheet time: 19mins
Wires made from some special materials melt quickly and break when a large electric current passes through it.these wires are used to make
Fuses
Electric fuses
A&B
Electromagnet
Q3. Which among the following are the advantages of heating effect of current?
1.Can be used in electric fuse
2.Increases the life of several appliances in the circuit.
3.It helps in preventing loss of energy.
Q4. Which among the following is the disadvantage of heating effect of current?
1.It can break the insulation of wires/ devices.
2.It prevents energy loss.
3.It is used in working of electric fuse.
Q5. Tungsten is used for the manufacture of an electric bulb because
A)it is malleable
B) it is inexpensive
C) it has a very high melting point
D) it is a good conductor
Q10. Select the one that you will prefer to make an electromagnet.
A) Steel
B) Plastic
C) Stainless steel
D) Soft iron
What is the symbol for a cell?
Identify closed circuit.
Which one of the following is based on the heating effect of current?
Geyser
Immersion rod
Hair Dryer
All of these
When an electric current flows through a wire, it behaves like a magnet.
True
False
Crane has a strong ………………….. attached to it
Electric circuit
Electromagnet
Electronic device
When an electric current flows through a copper wire AB as shown in Figure, the wire
deflects a magnetic needle placed near it
becomes red hot
gives electric shock
behaves like a fuse
Which of the following cannot be an example for the use of electromagnets
Electric Bell
Doorbells
Oven
Phone
Where can the key or switch be placed in the circuit?
The left side of the battery
The right side of the battery
Can be placed anywhere in the circuit
Near the positive terminal of the bulb
In making a battery
(a) the positive terminal of one cell is connected to the negative terminal of the next cell
(b) the positive terminal of one cell is connected to the positive terminal of the next cell
(c) the negative terminal of one cell is connected to the negative terminal of the next cell
(d) none of the above
a
b
c
d
The effects of current are:
Heating Effect
Lighting Effect
Magnetic Effect
Charging Effect
Longer line in cell symbol?
+ve
-ve
A fuse wire is a wire of-
High resistivity and low melting point
High resistivity and high melting point
Low resistivity and low melting point
Low resistivity and high melting point
Urvashi made a circuit and saw that some pins kept nearby were being attracted to the wires this is due to the __________ effect of electric current.
Heating
Gravitational
Magnetic
Attractive
Which of these is the symbol of a bulb?
Electric Bell works on the principle of-
Magnetism
Electromagnetism
Gravitation
Static Electricity
What is nutrition
mode of taking food and its utilisation by living organism
name of living orgaism
name of animal
It is name of vitamin
Chlorophyll is a
red pigment present in fruit
green pigment present in leaves
yellow pigment present in stem
brown coloured substance present in a tree
Ultimate source of Energy for a living organism is
Sun
River
Moon
Water
The leaves other than green also have
stomata
chlorophyll
cells
cuscuta
Two organisms are good friends and live together. One provides shelter, water, and nutrients while the other prepares and provides food. Such an association of organisms is termed as
saprophyte
parasite
autotrophs
symbiosis
Identify what is shown in the picture
chlorophyll
stomata
carbon dioxide
veins
Identify the bacteria
Staphylococcus
Bacillus
Pseudomonas
rhizobium
Insectivorous plants eat insects to fulfill their needs of
Energy
nitrogen,
potassium
calcium
Which of the following statements is NOT true?
Heterotrophs cannot prepare their own food.
Dodder is an example of parasite.
Saprophytes are green.
Pulses and Beans are legumes.
The term is used for the mode of nutrition in yeast, mushroom and bread-mould is
Autotrophic
Insectivorous
Saprophytic
Parasitic
Which of these plants should the farmer grow to replenish nitrogen back into the soil?
Wheat
Peas
Bacteria
Coral root
The presence of __________ in leaves indicates the occurance of photosynthesis.
Oxygen
Starch
Proteins
Fats
PARASITES
PREPARE THEIR OWN FOOD
LIVE ON OTHER LIVING ORGANISMS
LIVE ON DEAD ORGANISMS
EAT INSECTS
During photosynthesis, the stomata help in the intake of
Oxygen
Carbon dioxide
Water
Nitrogen
Which of the following is correct?
Algae is a parasite
Carbon dioxide is released during photosynthesis
Sun is ultimate source of energy
Mushroom is a autotroph
