A galvanometer when connected in a circuit, detects the presence of?

The resistance of a wire of length Land area of cross-section A is 1.0 Ω . The resistance of a wire of the same material, but of length 41 and area of cross-section 5A will be?

The potential difference across a copper wire is 5.0 V when a current of 0.5 A flows through it. The resistance of the wire is?

Two resistors. A (20Ω) and B (30Ω), are connected in parallel. The combination is connected to a 3 V battery. The current through the battery is?

A current-carrying straight conductor is placed in a magnetic field. The conductor experiences the maximum force when the angle between the direction of the current in it and the direction of the magnetic field is?

Two resistors. A of 10Ω and B of 30Ω, are connected in series to a battery of 6 V. The total heat dissipated in the resistors in 1 second is?

Consider the following statements about magnetic field due to a current-carrying straight conductor: Which of the above statements is/are correct?

1. (a) The direction of the south pole of a compass needle at a point gives the direction of the magnetic field at that point.
2. (b) The direction of the magnetic field lines gets reversed if the direction of the current in the conductor is reversed.

The potential difference across a copper wire is 2.0 V when a current of 0.4 A flows through it. The resistance of the wire is?

Two resistors, A of 6 Ω and B of 12 Ω, are connected in parallel to a battery of 3 V. The total energy supplied by the battery to the circuit in 1 second is ?

Two resistors A and B have resistances 5 chm and 10 ohm, respectively. If they are connected in series to a voltage source of 5 V. The ratio of power developed in resistor A to that of power developed in resistor B will be?

Which of the following method(s) can be used to change the direction of force on a current carrying conductor?

1. (i) Changing the magnitude of current
2. (ii) Changing the strength of magnetic field
3. (iii) Changing the direction of current

Two resistors R1, and R2, with resistances 2Ω and 3Ω, respectively, are connected in series to a 15V battery source. The current across R2 (in A) is?

Fleming's right-hand rule can be used to determine the direction of induced current when the angle between the magnetic field and the motion of the conductor is?

Which of the following materials is preferably used for electrical transmission lines?

Which of the following devices is based on the principle of electromagnetic induction?

Which of the following statements is/are true for a current carrying straight conductor?

1. i) The magnetic field lines are concentric circles with conductor at the centre.
2. (ii) The strength of the magnetic field increases as we move away from the conductor.
3. (iii) The direction of magnetic field can be determined using right hand thumb rule.

Which of the following home appliances does NOT use an electric motor?

In a dynamo, electric current is produced using the principle of?

An electric heater rated 1000 W and an electric geyser rated 2000 W are med for 4 hours daily. The energy consumed in 10 days (in kWh) is?

Which of the following statements is/are true for a DC motor?

1. (1) The function of the split rings is to reverse the flow of current.
2. (ii) Maximum force is experienced by arms of the coil aligned parallel to the magnetic field
3. (iii) Reversing current after every half rotation leads to continuous rotation of coil

Which of the following devices is/are based on heating effect of electric current?

1. (i) Incandescent lamp
2. (ii) Electric geyser
3. (iii) Electric generator

Q.2 Ramesh wants to choose a material for making filament of a bulb. The chosen material should possess which of the following properties?

1. (1) Low melting point
2. (ii) Ability to glow at high temperatures
3. (iii) High resistance

What is the process of generating current induced by a change in magnetic field called?

The ratio of the field due to a current-carrying circular coil of n turns to the field due to a single circular loop of the same radius carrying the same current is _________?

To investigate the conduction of electric current, Ravi performed an experiment. He took different aqueous solutions or liquids (as electrolyte) and tried to pass electricity and connected the circuit with a bulb. In the presence of which of the following, will the bulb NOT glow?

The magnetic field produced due to a circular coil carrying a current having six turns will be how many times that of the field produced due to a single circular loop carrying the same current?

A magnet, when moved near a coil, produces an induced current. Which of the following method(s) can be used to increase the magnitude of the induced current?

1. (1) Increasing the number of turm in the coil
2. (2) Increasing the speed of the magnet
3. (3) Increasing the resistivity of the wire of the coil

To connect a number of resistors in parallel can be considered equivalent to?

An AC generator works on the principle of?

The armature of an electric motor consists of which of the following parts?

1. (i) Soft iron core
2. (ii) Coil
3. (iii) Magnets

The filament of a bulb is made extremely thin and long in order to achieve?

Which of the following non-metals is a good conductor of electricity?

State two factors on which the electrical energy consumed by an electric appliance depends?

Why should an electrician wear rubber gloves while repairing an electrical switch?

A power plant where the heat required to make steam to drive turbines to make electricity is obtained by burning fuels is called?

What is the resultant resistance of 3 Ω and 6 Ω resistances connected in series?

മറ്റൊരു വസ്തുവിലെ ചാർജിൻ്റെ സാന്നിധ്യം മൂലം ഒരു വസ്തുവിലെ ചാർജുകൾക്ക് ഉണ്ടാകുന്ന പുനഃക്രമീകരണത്തെ _________________എന്നു വിളിക്കുന്നു.

രണ്ട് പ്രസ്ത‌ാവനകൾ നൽകിയിരിക്കുന്നു അവ അപഗ്രഥിച്ച്, തുടർന്ന് നൽകിയിട്ടുള്ളതിൽ നിന്നും ശരിയായത് തെരഞ്ഞെടുക്കുക :

1. പ്രസ്ത‌ാവന I വൈദ്യുതകാന്തങ്ങൾ ഉണ്ടാക്കുന്നതിന്, ഉരുക്കിനേക്കാൾ കൂടുതൽ ഉചിതമായത് പച്ചിരുമ്പാണ്.
2. പ്രസ്‌താവന II : പച്ചിരുമ്പിന് ഉരുക്കിനേക്കാൾ ഉയർന്ന കാന്തിക വശഗതയും, ഉയർന്ന കാന്തിക റിറ്റൻവിറ്റിയും ഉണ്ട്.

വൈദ്യുത ചാർജ്ജിന്റെ സാന്നിധ്യം തിരിച്ചറിയാൻ ഉപയോഗിക്കുന്ന ഉപകരണം ?

1000 W പവർ ഉള്ള ഒരു ഇലക്ട്രിക് അയേൺ എത്ര മണിക്കൂർ പ്രവർത്തിക്കുമ്പോഴാണ് ഒരു യൂണിറ്റ് വൈദ്യുതി ഉപയോഗിക്കുന്നത് ?

Of the following which one can be used to produce very high magnetic field?

Capacitative reactance is

The flux of total energy flowing out through a closed surface in unit area in unit time in electric magnetic field is

The scientific principle behind the working of a transformer is

Ohm is a unit of measuring _________

The unit of current is

Electric current is measure by