1. A plant with green leaves placed in red light will appear
a. Blue
b. Brown
c. Black
d. Red
2. Electromagnetic radiation is emitted by
a. X-Rays
b. Ultrasonic waves
c. Electrons
d. Protons
3. The common refrigerant used in domestic refrigerator is:
a. Neon
b. Spirit
c. Freon/Ammonia
d. None of these
4. A fuse wire is characterized by:
a. High resistance and high melting point
b. Low resistance and high melting point
c. High resistance and low melting point
d. Low resistance and low melting point
5. Who said “A body will remain at rest unless an external force acts on the body”?
a. Newton
b. Einstein
c. Archimedes
d. Galileo
6. Which metal is commonly used as an electromagnet?
a. Copper
b. Nickel
c. Gold
d. Iron
7. When ice melts in a beaker of water, the level of water in beaker will:
a. Increase
b. Decrease
c. Remains the same
d. First increase and then decrease.
8. Which of the following does not admit any division?
a. Atom
b. Molecules
c. Compound
d. All
9. The dynamo converts;
a. Mechanical energy into electrical energy
b. Mechanical energy into heat energy
c. Electrical energy into mechanical energy
d. None of these
10. The M.K.S. unit of electric charge is :
a. Volt
b. Ampere
c. Watt
d. Coulomb
11. The oil in the wick of an oil lamp rises up due to:
a. Pressure difference
b. Capillary action
c. Low velocity of oil
d. Gravitational force
12. The function of the choke is to:
a. Give relatively large impedance of alternating current
b. Give relatively large impedance of direct current
c. Regulate the voltage
d. Increase the voltage
13. If the length of a heater coil is reduced by 10% of its original length, then power consumed by heater will:
a. Increase over 10%
b. Decrease by 10%
c. Increase by 0.5%
d. Decrease by 0.5%
14. A red light is used in traffic signal because
a. It has the longest wavelength and can be easily noticed from long distance
b. It is beautiful
c. It is visible to the people even with bad eyesight
d. None of these
15. The most convenient colour combination that can be used for vehicles running day and night is :
a. Orange and blue
b. White and black
c. Red and green
d. Yellow and blue
16. Metals are good conductor of electricity because:
a. They contain free electrons
b. The atoms are highly packed
c. They have high melting point
d. All of above
17. When iron and wood are exposed to the sunlight, the iron rod becomes hot quickly because:
a. Greater thermal conducting of iron
b. Lower thermal conducting of iron
c. More density of iron
d. Less density of iron
18. Water cannot be used to extinguish fire caused by an electric current because:
a. It may cause another short circuit
b. It may cause hydrolysis
c. It may cause electrocution
d. It will spoil the wiring
19. In diesel engines, ignition takes place by:
a. Compression
b. Electric Spark
c. Dynamo
d. Battery
20. A sprayer works on the principle of
a. Newton
b. Archimedes
c. Boyle
d. Pascal
a. Blue
b. Brown
c. Black
d. Red
2. Electromagnetic radiation is emitted by
a. X-Rays
b. Ultrasonic waves
c. Electrons
d. Protons
3. The common refrigerant used in domestic refrigerator is:
a. Neon
b. Spirit
c. Freon/Ammonia
d. None of these
4. A fuse wire is characterized by:
a. High resistance and high melting point
b. Low resistance and high melting point
c. High resistance and low melting point
d. Low resistance and low melting point
5. Who said “A body will remain at rest unless an external force acts on the body”?
a. Newton
b. Einstein
c. Archimedes
d. Galileo
6. Which metal is commonly used as an electromagnet?
a. Copper
b. Nickel
c. Gold
d. Iron
7. When ice melts in a beaker of water, the level of water in beaker will:
a. Increase
b. Decrease
c. Remains the same
d. First increase and then decrease.
8. Which of the following does not admit any division?
a. Atom
b. Molecules
c. Compound
d. All
9. The dynamo converts;
a. Mechanical energy into electrical energy
b. Mechanical energy into heat energy
c. Electrical energy into mechanical energy
d. None of these
10. The M.K.S. unit of electric charge is :
a. Volt
b. Ampere
c. Watt
d. Coulomb
11. The oil in the wick of an oil lamp rises up due to:
a. Pressure difference
b. Capillary action
c. Low velocity of oil
d. Gravitational force
12. The function of the choke is to:
a. Give relatively large impedance of alternating current
b. Give relatively large impedance of direct current
c. Regulate the voltage
d. Increase the voltage
13. If the length of a heater coil is reduced by 10% of its original length, then power consumed by heater will:
a. Increase over 10%
b. Decrease by 10%
c. Increase by 0.5%
d. Decrease by 0.5%
14. A red light is used in traffic signal because
a. It has the longest wavelength and can be easily noticed from long distance
b. It is beautiful
c. It is visible to the people even with bad eyesight
d. None of these
15. The most convenient colour combination that can be used for vehicles running day and night is :
a. Orange and blue
b. White and black
c. Red and green
d. Yellow and blue
16. Metals are good conductor of electricity because:
a. They contain free electrons
b. The atoms are highly packed
c. They have high melting point
d. All of above
17. When iron and wood are exposed to the sunlight, the iron rod becomes hot quickly because:
a. Greater thermal conducting of iron
b. Lower thermal conducting of iron
c. More density of iron
d. Less density of iron
18. Water cannot be used to extinguish fire caused by an electric current because:
a. It may cause another short circuit
b. It may cause hydrolysis
c. It may cause electrocution
d. It will spoil the wiring
19. In diesel engines, ignition takes place by:
a. Compression
b. Electric Spark
c. Dynamo
d. Battery
20. A sprayer works on the principle of
a. Newton
b. Archimedes
c. Boyle
d. Pascal