Q.1:- A piece of glass is heated to high temperature and then allowed to cool. If it cracks, a possible reason for this is the following property of glass ?
- Low thermal conductivity
- High thermal conductivity
- High specific heat
- Low specific heat
Q.2:- The heat transferred by the radiator of a refrigerator is ?
- More than that at the freezer
- Less than that at the freezer
- The same as that at the freezer
- None of these
Q.3:- If the atmospheric temperature and the dew point are nearly equal then ?
- The relative humidity is 100%
- The relative humidity is zero
- The relative humidity is 50%
- None of these
Q.4:- Clear night are colder than cloudy nights because of ?
- Conduction
- Condensation
- Radiation
- Insolation
Q.5:- The best conductor of heat among the following is ?
- Alcohol
- Mercury
- Ether
- Water
Q.6:- The wavelength of the radiation emitted by a body depends upon ?
- The nature of the surface
- The area of the surface
- The temperature of the surface
- All of the above factors
Q.7:- The speed of light with the rise in the temperature of the medium ?
- Increases
- Decreases
- Remains unaltered
- Drops suddenly
Q.8:- A permanent magnet repels ?
- Ferromagnetic substances only
- Diamagnetic substances only
- Paramagnetic substances only
- Both paramagnetic and diamagnetic substances
Q.9:- Fleming’s right hand rule is used to find the direction of the ?
- Alternate current
- Direct current
- Induced current
- Actual current
Q.10:- What is the most commonly used substance in fluorescent tubes ?
- Sodium oxide and argon
- Sodium vapour and neon
- Mercury vapour and argon
- Mercury oxide and neon
Q.11:- A transformer works with ?
- Alternating current
- Direct current
- Both AC and DC
- Any signal
Q.12:- A substance which radiates light when heated to a light temperature is said to be ?
- Luminescent
- Incandescent
- Fluorescent
- Phosphorescent
Q.13:- Why you walk on a woollen carpet and bring your finger near the metallic handle of a door an electric check is produced. This is because ?
- Charge is transferred from your body to the handle
- The temperature of the human body is higher than of the handle
- A chemical reaction occurs when you touch the handle
- The human body and the handle arrive at thermal equilibrium by the process
Q.14:- A fuse wire is always connected to the ?
- Line wire
- Earth wire
- Neutral wire
- None of these
Q.15:- Ampere rule is used to find the ?
- Direction of current
- Direction of magnetic field
- Direction of motion of the conductor
- None of these
Q.16:- Alternating current can be measured by ?
- Moving coil galvanometer
- Hot wire ammeter
- Tangent galvanometer
- None of these
Q.17:- The frequency of AC main in India is ?
- 100 Hz
- 50 Hz
- 1/100 Hz
- 1/50 Hz
Q.18:- Photoelectric effect can be explained by assuming that light ?
- Is a form of transverse wave
- Is a form of longitudinal wave
- Can be polarised
- Consists of quanta
Q.19:- The unit of electrical power is ?
- Volt
- Watt
- Kilowatt Hour
- Ampere
Q.20:- Instrument used to store the electric charge is known as ?
- Inductor
- Capacitor
- Transformer
- Transistor
Q.21:- Ohm’s law does not apply to which of the following ?
- C. Circuits
- Conductors
- Semi Conductors
- None of these
Q.22:- A fuse wire is made of ?
- An alloy of Tin and Copper
- An alloy of Tin and Lead
- An alloy of Tin and Aluminium
- An alloy of Nickel and Chromium
Q.23:- Fluorescent tubes are fitted with a choke. The choke coil ?
- Steps up the line voltage
- Steps down the line voltage
- Reduces current in the circuit
- Chokes low frequency current
Q.24:- Domestic electric wiring is basically a ?
- Series connection
- Parallel connection
- Combination of series and parallel connections
- Series connection within each room and parallel connection elsewhere
Q.25:- The phenomenon of electromagnetic induction implies a production of induced ?
- Resistance in a coil when the magnetic field changes with time
- Current in a coil when a electric field changes with time
- Current in a coil when a magnetic field changes with time
- Voltage in a coil when a magnetic field changes with time
