MCQ OF SOURCES OF ENERGY, CLASS: X

SOURCES OF ENERGY

CLASS: X

1. Solar energy can be used to produce :

(A) electrical energy (B) heat energy (C) mechanical energy (D) all of the above (E) none of these

2. The energy processed by wind is :

(A) kinetic energy (B) potential energy (C) thermal energy (D) sound energy (E) none of these

3. The fuel used in a stream engine is :

(A) water (B) carbon monoxide (C) oxygen (D) none of these

4. A solar cell convert heat and light energy into :

(A) heat energy (B) sound energy (C) electrical energy (D) wind energy. (E) none of these

5. Biogas is a mixture of :

(A) Carbon monoxide , hydrogen gas and methane  (B) Carbon monoxide , hydrogen gas 

(C) Carbon dioxide , hydrogen gas and methane (D) none of these

6. The sources of energy which are being produced continuously in nature and are inexhaustible are called :

(A) conventional sources (B) non-conventional sources (C) non-renewable sources (D) none of these

7. Choose the source of energy which is different from others :

(A) Wood (B) Falling water (C) Wind (D) Petroleum (E) none of these

8. The vast amount of sea weeds present in oceans may provide an endless source of :

(A) hydro energy (B) ocean thermal energy (C) methane (D) none of these

9. Energy available from the oceans is :

(A) OTE (B) sea-waves energy (C) tidal energy (D) all of the above (E) none of these

10. Radiations used to get relief from bodyaches are :

(A) I.R.radiations (B) U.V. radiations (C) Visible radiations (D) None of these

11. Wood is a :

(A) primary fuel (B) liquid fuel (C) processed fuel (D) secondary fuel (E) none of these

12. Which of the following is as example of fossil fuel ?

(A) Coal gas (B) Coke (C) Natural gas (D) Producer gas (E) none of these

13. The device in which the nuclear fission and release of energy is controlled, is known as :

(A) Thermopile (B) Thermostat (C) Nuclear reactor (D) Cloud chamber (E) none of these

14. For a sustained chain reaction, the reproduction factor should be :

(A) 1 (B)  10  (C) infinite  (D)  none of these

15. Role of Moderator  in nuclear reactor for :

(A) slowing neutrons (B) accelerating neutrons (C) stopping neutrons (D) heating the neutrons (E) none of these

16. The fusion reaction occur at :

(A) low pressures (B) low temperature (C) extremely high temperature (D) high temperature and low pressures

17. The source of energy of the sun is :

(A) Nuclear fission (B) Chemical reaction (C) Nuclear fusion (D)  All of these  (E) None of these

18. The number of neutrons in an atom X of atomic number Z and mass number A is :-

(A) zero (B) Z (C) A - Z (D) A (E) none of these

19. When a beta particle is given out, the atomic number of the parent atom :

(A) Increase by unity (B) Decrease by unity (C) Remains the same (D) Is halved

20.. Which have least penetrating power ?

(A) Alpha particles (B) Gamma rays (C) Beta particles (D) All have the same penetrating power (E) none of these

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MCQ OF MAGNETIC EFFECTS & EMI, CLASS: X

MAGNETISM AND EMI

CLASS: X

1. When a bar magnet is broken into two pieces :
(A) we will have a single pole on each piece (B) each piece will have two unlike poles
(C) each piece will have two like poles (D) None of these

2. The magnetic field intensity produced due to a current carrying coil is maximum at :
(A) any point (B) any point lying on the axis of the coil (C) points lying between centre of the coil and its circumference (D) none of these

3. The direction of magnetic lines of force produced by passing a direct current in a conductor is :
(A) perpendicular to the conductor & coming outwards
(B) parallel to conductor
(C) surrounding the conductor and of circular nature
(D) perpendicular to the conductor & coming inwards

4. Which of the following statement is not correct about two parallel conductors carrying equal currents in the same direction ?
(A) Every conductors will experience a force. (B) The two conductors will repel each other.
 (C) Each of the conductors will move if not prevented from doing so. (D) none of these

5. Which of the following determine the direction of magnetic field due to a current carrying conductor ?
(A) Faraday’s laws of electromagnetic induction. (B) Fleming’s left-hand rule.
(C) Lenz’s law. (D) Maxwell’s cork screw rule. (E) none of these.

6. If the cylindrical bar magnet is kept along axis and  rotated about its axis, then :
(A) a current will be induced in the coil (B) no current will be induced in the coil. (C) only emf will be induced in the coil (D) am emf and current both will be induced in the coil (E) none of these

7. In the figure QR is a vertical conductor and the current I flows from R to Q. P is a point on the horizontal plane and is to the south of the wire. The direction of the magnetic field at P due to the current will be towards :
(A) upward (B) north (C) east (D) west (E) none of these

8. A length of wire carries steady current. It bent first to form a circular plane coil of one turn. The same length is now bent to give a double loop of smaller radius. The magnetic field produced at the centre by the same current will be :
(A) a quarter of its first value (B) a half of first value (C) four times its first value (D) unaltered (E) none of these

9. The intensity of a magnetic field is defined as the force experienced by a :
(A) standard compass (B) unit positive charge
(C) unit negative charge (D) unit north pole

10.. A wire carrying a current of 5A is placed perpendicular to a magnetic induction of 2T. The force on each centimeter of the wire is :
(A) 1N (B) 100 (C) 0.1 N (D) 10 N

11. If a soft iron piece is buried under the surface of earth in the north and south direction, then
(A) it will acquire the properties of a magnet (B) its properties will not change
(C) it will behave like an insulator (D) can’t say with surity

12. Force acting on a stationary charge Q in the magnetic field B is -
(A) B Q V (B) BV/Q (C) Zero (D) BQ/V

13. The permanent magnets are kept with soft iron pieces at ends and keepers :
(A) to magnetise the soft iron pieces (B) to increase the strength of the magnets
(C) to avoid self demagnetisation (D) for physical safety of the magnets

14. The device whish is used for converting mechanical energy into electrical energy is called :
(A) electric motor (B) dynamo (C) transformer (D) battery

15. In case of a DC generator a large number of coils each having many turns and arranged in different turns are used :
(A) to get high voltage DC (B) to get high ampere DC
(C) to get smooth DC (D) get pulsating current

16. Lenz’s law is a consequence of the law of conservations of :
(A) energy (B) momentum (C) angular momentum (D) charge and mass

17. In a DC generator, the induced e.m.f. in the armature is :
(A) DC (B) AC` (D) fluctuating DC (D) both AC and DC

18. The induced emf produced when a magnet is inserted into a coil does not depend upon :
(A) the number of turns in the coil (B) the magnetic moment of the magnet
(C) the magnetic moment of the magnet (D) all of these  (E) none of these

19. When the current through a solenoid increases at a constant rate, the induced current :
(A) is a constant and in the direction of inducing current
(B) is a constant and is opposite to the direction of inducing current
(C) increases with time and is in the direction of inducing current
(D) increases with time and opposite to the direction of inducing current

20. The device whish is used for converting electrical energy into mechanical energy is called :
(A) electric (B) dynamo (C) transformer (D) battery

21.The current in the armature of a dc motor is maximum when :
(A) the motor achieves maximum speed (B) the motor achieves intermediate speed
(C) the motor is switched on (D) the motor is switched off

22. The effect of using split rings in a simple DC motor is that :
(A) the direction of rotation of the coil is reversed
(B) the current in the coil always flows in the same direction
(C) the direction of the current flowing in the coil is reversed
(D) None of these

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