According to Maxwell’s right-hand thumb rule, what gives the direction of magnetic field lines around the wire?
1.Direction of thumb
2.Direction of fingers encircling wire
3.Direction opposite to thumb
4.Direction of index finger
 Maxwell’s right-hand thumb rule is also known as:
1.Biot-Savart law
2.Hall Effect
3.Born rule
4.Corkscrew rule
 The heating elements of electric iron and toaster are made of:
1.Metals
2.Alloys
3.Glass
4.Hard rubber
 Which of the following is the function of superconductor?
1.It conduct electricity at low temperature
2.It offer high resistance to the flow of current
3.It offer no resistance to the flow of electricity
4. It conduct electricity at high temperatures
 Which of the following is/are the components of Camera?
1.The body which is light tight and contains all the mechanical parts.
2.The lens which is a convex (converging) lens).
3.The film or a charged couple device in the case of a digital camera.
4. All of the above
 Which of the following metals has the lowest resistivity?
1.Nickel
2.Manganese
3.Silver
4.Mercury
 Which of the following statement(s) is/are correct about the Refraction Rules for a Diverging Lens?
1.Any incident ray travelling parallel to the principal axis of a diverging lens will refract through the lens and travel in line with the focal point (i.e., in a direction such that its extension will pass through the focal point).
2.Any incident ray travelling towards the focal point on the way to the lens will refract through the lens and travel parallel to the principal axis.
3.Both A & B
4.None of the above
Name a device through which the truthness of the human being is examined?
1. Paicnometer
2.Quadrant
3.Polygraph
4.Radiometer
Magnetic effect around a wire is due to:
1. The presence of metal
2.Current flowing in it
3.Circular loop
4.No current in it
Magnetic effect of current gives rise to which force?
1.Mechanical
2.Friction
3.Spring
4.Gravitational
On what does the resistivity of a substance depends?
1.Length
2.Thickness
3.Temperature
4.All of the above
Semi-conductors are used for making:
1.Solar cells
2. Toasters
3. Geysers
4.Room heaters
The strength of magnetic field produced by a current carrying circular coil can be increased by:
1.Increasing number of turns of wire
2. Increasing current flow
3. Decreasing radius of coil
4.All of the above
What is the advantage of parallel connection of circuits?
1.Same voltage is available
2.All appliances get fused
3.Fluctuation
4.All of the above
What is the formula for calculating resistivity of the material of a conductor?
1.Resistivity = R * A/ L
2.Resistivity = R + A/ I
3.Resistivity = R - A/ I
4.Resistivity = R * A
What is the resistivity of aluminium?
1. 2.63 * 10-8 ohm-meter
2.1.60 * 10-8 ohm-meter
3.44 * 10-8 ohm-meter
4.184.0 * 10-8 ohm-meter
What is the SI unit of electric power?
1.Coulomb
2.Watt
3.Volt
4. Meter
What is the SI unit of resistivity?
1.Meter
2.Watt
3.Ohm-metre
4.Volt
What kind of magnetic field lines will be produced around a straight wire carrying current?
1.Bigger circles
2.Straight
3.Concentrated circles
4.Parallel straight
What make the metals are good conductors of electricity?
1.Because they contain free electrons
2.Because the atoms are lightly packed
3.Because they have high melting point
4.All of the above
What will happen to the water when a thin capillary tube is replaced with another insufficient length of tube?
1.will overflow
2.will not rise
3.depressed
4.change its meniscus
Which alloy is used to make the heating elements of electric iron, electric kettle, geysers etc.?
1.Constantan
2.Manganin
3.Nichrome
4.All of the above
Which colour of insulation covering is there on the earth wire that goes from main switch to our rooms?
1. Red
2.Black
3.Green
4.Yellow
Which device is used to listen the vibrations of the heart and lungs?
1.Spectroscope
2.Stethoscope
3. Stereoscope
4.None of the above
Which devise is used to measure the intensity of the earthquake?
1.Seismograph
2.Oscilliograph
3. Comograph
4. Cardiograph
Which of the following are semi-conductors?
1.Nichrome
2.Copper
3. Silicon
4.Aluminium
Which of the following current carrying wires will have strong magnetic field?
1.Straight
2.Circular loop
3. Solenoid
4.All of the above
Which of the following devices is run by power circuit in the house?
1. Tube-lights
2.Electric iron
3. Television
4.Radio
Which of the following is measured in Pa (Pascal)?
1.Thrust
2.Pressure
3.Frequency
4.Conductivity
Which of the following is not emitted by radioactive substance?
1.Electrons
2.Electromagnetic radiations
3.Alpha particles
4.Neutrons
Which of the following is the correct function of Rectifiers (convertor)?
1.Direct current to Alternating current
2.Alternating current to Direct current
3.High voltage to low voltage
4.Low voltage to high voltage
Which of the following is the correct pair that have not identical dimension of physical quantities?
1.Pressure and Young's modules
2.Planck's constant and Angular momentum
3.Impelling force or strength and moment of force
4.Physical energy or intensity and rate of change of linear momentum
Which of the following is the property of RADAR? Â
1.Locating submerged submarines
2.Receiving signals in a radio receiver
3.Locating geostationary satellites
4.Detecting and locating the position of objects such as aeroplanes
Which of the following statement (s) is/are correct about viscosity?
1.It is a measure of its resistance to gradual deformation by shear stress or tensile stress.
2.It is typically measured in dynes/cm, the force in dynes required to break a film of length 1 cm.
3.It is the ability of a body to resist a distorting influence or stress and to return to its original size and shape when the stress is removed.
4.None of the above
Which of the following statement(s) is/are correct about Refraction Rules for a Converging Lens?
1. Any incident ray travelling parallel to the principal axis of a converging lens will refract through the lens and travel through the focal point on the opposite side of the lens.
2.Any incident ray travelling through the focal point on the way to the lens will refract through the lens and travel parallel to the principal axis.
3.Both A & B
4.None of the above
Which of the following utilise magnetic effect of current?
1.Electric motor
2.Telephone
3.Radio
4.All of the above
Which of the following wires is necessary in the house?
1.Live wire
2.Earth wire
3.Neutral wire
4.All of the above
Who discovered the magnetic field of current?
1. William Gilbert
2.Hans Christian Oersted
3.Benjamin Franklin
4.Charles Augustin de Coulomb
Why the Planets do not twinkle?
1.Because they emit light of a constant intensity
2.Because their distance from the earth does not change with time
3.Because they are very far away from the earth resulting in decrease in intensity of light
4.Because they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable