Monday, October 30, 2017

WORK AND ENERGY TEST PAPER

1.      Work done upon a body a

(a) A vector quantity

(b) A scalar quantity

(c) Always positive

(d) Always negative

2.      In the SI system, the unit of PE. Is

(a) Erg

(b) Dyne-cm

(c) J

(d) None of these

3.      Kilowatt hour (kWh) represents the unit of

(a) Power

(b) Impulse

(c) Momentum

(d) None of these

4.      Two unequal masses possess the same momentum, the kinetic energy of the heavier mass is ------ the kinetic energy of the lighter mass.

(a) Same as

(b) Greater than

(c) Greater than

(d) Much greater than

5.      A truck and a car are moving on a smooth, level is same. Brakes are applied to both of them simultaneously. Which one will cover a greater distance before it stops?

(a) Car

(b) Truck

(c) Both will cover the same distance

(c) Nothing can be decided

6.      Two spherical balls of the same radius but of different masses, are propped at the same time from the top of a tower 19.6 m high. When they are 1.6 m above the ground, the balls will possess the same.

(a) K.E.

(b) P.E.

(c) Momentum

(d) Total energy

7.      A photocell converts light energy into

(a) Chemical energy

(b) Electrical energy

(c) Heat energy

(d) Mechanical energy

8.      Watt sec represents the unit for

(a) Energy

(b) Power

(c) Force

(d) None of these

9.      A flying aeroplane has

(a)    Only potential energy

(b)   Only kinetic energy

(c)    Both potential and kinetic energy

(d)   None of these

10.  Steam engine converts

(a)    Heat energy into sound energy

(b)   Heat energy into mechanical energy

(c)    Mechanical energy into heat energy

(d)   Electrical energy into sound energy

11.  A body at rest can have

(a) Speed

(b) Energy

(c) Momentum

(d) Velocity

12.  The flowing water of a river possesses -------- energy.

(a) Gravitational

(b) Potential

(c) Electrical

(d) Kinetic

13.  A bird flying in the sky has

(a) K.E. only

(b) P.E. only

(c) Neither K.E. nor P.E.

(d) Both K.E. and P.E.

14.  A body rolling down a hill has

(a) K.E. only

(b) P.E. only

(c) Neither K.E. nor P.E.

(d) Both K.E. nor P.E.

THE SUN AND NUCLEAR ENERGY TEST PAPER

1.      An atom bomb is based on the principle of

(a) Nuclear fission

(b) Nuclear fusion

(c) The liquid drop model

(d) None of these

2.      The average amount of energy released during the fission of a uranium atom is about

(a) 100 Me V

(b) 200 Me V

(c) 300 Me V

(d) 10 Me V

3.      One electron volt is equal to

(a) 1.602 X 10-19 J

(b) 1.602 X 10-19V.

(c) 1.602 X 10-19 C

(d) None of these

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

(a) Increases by unity

(b) Decreases by unity

(c) Remains the same

(d) Is halved

5.      The process of fusion is used for constructing a

(a) Atom bomb

(b) Ordinary bomb

(c) Hydrogen bomb

(d) Neutron bomb

6.      In a nuclear reactor, the moderator is

(a) Uranium -234

(b) Uranium-238

(d) Heavy water

7.      Which of the following is a good nuclear fuel?

(a) Uranium-236

(b) Neptunium-239

(c) Thorium-236

(d) Plutonium-239

(a) Rutherford

(b) Becquerel

(c) Bohar

9.      The radiant energy of the sun results from

(a) Nuclear fission

(b) Nuclear fusion

(c) Combustion

10.  Which of the following has the least penetrating power?

(a) Alpha particles

(b) Beta particles

(c) Gamma rays

(d) All have the same penetrating power

11.  The temperature of the sun's core is about

(a) 103 0C

(b) 104 0C

(c) 105 0C

(d) 106 0C

12.  The nuclear fuel in the sun is

(a) Helium

(b) Uranium

(c) Hydrogen

(d) Alpha particles

13.  Most of the propellants used in rockets are

(a) Solids

(b) Liquids

(c) Gases

(d) All the above

14.  Which of the following cannot be seen by the eye?

(a) Ultraviolet rays

(b) Gamma rays

(c) Infra red rays

(d) All the above

15.  The release of energy when fission occurs in a nuclear chain reaction is the basis of

(a) Atom bomb

(b) Hydrogen bomb

(c) Neutron bomb

(d) None of these

16.  The fuel used in nuclear power plants is

(a) U-235

(b) U-238

(c) U-236

(d) Enriched U-235

17.  Which of the following is not used as a coolant in a nuclear reactor?

(a) Liquid sodium metal

(b) Water

(c) Carbon dioxide gas

(d) Heavy water

18.  Which of the following types of energy is produced in a nuclear reactor?

(a) Nuclear energy

(b) Electrical energy

(c) Mechanical energy

(d) Heat energy

19.  The natural uranium are is processed and enriched at the Nuclear Fuel complex at

(a) Kolkata

(b) Mumbai

(d) None of these

20.  India's first power station is

(a)    BARC

(b)   Tarapur atomic power station

(c)    Narora atomic power station

(d) None of these

SOURCES OF ENERGY TEST PAPER

1.      A steam engine coverts the heat energy of steam into

(a) Electrical energy

(b) Nuclear energy

(c) Mechanical energy

(d) None of these

2.      A motor coverts electrical energy into

(a) Mechanical energy

(b) Chemical energy

(c) Nuclear energy

(d) Thermal energy

3.      A battery coverts chemical energy into

(a) Mechanical energy

(b) Solar energy

(c) Electrical energy

(d) None of these

4.      Solar energy can be used to produce

(a)    Electrical energy

(b)   Mechanical energy

(c)    Heat energy

(d) All the above

5.      The fractional distillation of coaltar yields

(a) Carbon disulphide

(b) Kerosene oil

(c) Carbon tetrachloride

(d) Benzene

6.      Which of the following is not used as a rocket fuel?

(a) Synthetic rubber

(b) Liquid hydrogen

(c) Paraffin

(d) Liquid nitrogen

7.      Which of the following compound has a least Heating value?

(a) Alcohol

(b) Biogas

(c) Wood

(d) Coal

8.      In chulhas, gaps are left between the logs

(a)    To decrease the ignition temperature of the fuel

(b)   To allow the air to enter and facilitate fuel burning

(c)    To cut off of the supply of air

(d)   All of these

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

(a) Nuclear energy

(b) Methane

(c) Thermal energy ocean

(d) None of these

10.  The energy of water is called

(a) Mechanical energy

(b) Hydro energy

(c) Solar energy

(d) None of these

11.  Which of the following fuel is different from others?

(a) Water gas

(b) Coal gas

(c) Producer gas

(d) Coke

12.  Which of the following fuel is different from others?

(a) Diesel

(b) Gasoline

(c) Alcohol

(d) Lignite

13.  The efficiency of the modern solar cells from selenium is up to

(a) 25%

(b) 40%

(c) 65%

(d) 80%

14.  The box-type solar cooker cannot be used

(a)    For frying and baking

(b)   During night time

(c)    During the cloudy days

(d)   All the above are correct

15.  The group of solar cells joined together in a definite pattern is called a

(a) Battery

(b) Solar heater

(c) Solar cooker

(d) Solar cell panel

16.  Which of the following can be used to fabricate a solar cell?

(a) Platinum

(b) Gold

(c) Silver

(d) Selenium

17.  Every hot object emits

(a) Infrared rays

(b) Visible rays

(c) X-rays

(d) All the above

HEATING, CHEMICAL AND MAGNETIC EFFECTS OF CURRENT TEST PAPER

1.      A motor converts

(a)    Mechanical energy into electrical energy

(b)   Mechanical energy into sound energy

(c)    Electrical energy into mechanical energy

(d)   Electrical energy into sound energy

2.      A dynamo converts

(a)    Mechanical energy into sound energy

(b)   Mechanical energy into electrical energy

(c)    Electrical energy into mechanical energy

(d)   Electrical energy into sound energy

3.      By inserting a soft iron piece into a solenoid, the strength of the magnetic field

(a) Increases

(b) Decreases

(c) First increases then decreases

(d) Remains unchanged

4.      In a hydel station, the motion produced in turbines is due to the

(a)    Burning of coal

(b) Burning of diesel

(c)    Flow of water

(d)   Production of steam

5.      At grid sub-stations the voltage is stepped up to reduce loss of

(a) Current

(b) Electrical energy

(c) Power

(d) Resistance

6.      Laws of heating are given by

(a) Joule

(d) Ohm

(c) Maxwell

7.      An electric bulb coverts electrical energy into

(a)    Sound energy

(b)   Mechanical energy

(c)    Nuclear energy

(d) None of these

8.      The wire having a red plastic covering is  a

(a) Live wire

(b) Neutral wire

(c) Earth wire

(d) None of these

9.      The wire having a black plastic covering is a

(a) Live wire

(b) Neutral wire

(c) Earth wire

(d) None of these

10.  The wire having a green plastic covering is a

(a) Live wire

(b) Neutral wire

(c) earth wire

(d) None of these

11.  An electric fuse works on the --------- effect of current.

(a) Heating

(b) Magnetic

(c) Chemical

(d) None of these

12.  The touching of the live and neutral wire directly is known as

(a) Power rating

(b) Short circuit