Physics Selected Questions and Answers Set 10

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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 ?

  1. Low thermal conductivity
  2. High thermal conductivity
  3. High specific heat
  4. Low specific heat

Q.2:- The heat transferred by the radiator of a refrigerator is ?

  1. More than that at the freezer
  2. Less than that at the freezer
  3. The same as that at the freezer
  4. None of these

Q.3:- If the atmospheric temperature and the dew point are nearly equal then ?

  1. The relative humidity is 100%
  2. The relative humidity is zero
  3. The relative humidity is 50%
  4. None of these

Q.4:- Clear night are colder than cloudy nights because of ?

  1. Conduction
  2. Condensation
  3. Radiation
  4. Insolation

Q.5:- The best conductor of heat among the following is ?

  1. Alcohol
  2. Mercury
  3. Ether
  4. Water

Q.6:- The wavelength of the radiation emitted by a body depends upon ?

  1. The nature of the surface
  2. The area of the surface
  3. The temperature of the surface
  4. All of the above factors

Q.7:- The speed of light with the rise in the temperature of the medium ?

  1. Increases
  2. Decreases
  3. Remains unaltered
  4. Drops suddenly

Q.8:- A permanent magnet repels ?

  1. Ferromagnetic substances only
  2. Diamagnetic substances only
  3. Paramagnetic substances only
  4. Both paramagnetic and diamagnetic substances

Q.9:- Fleming’s right hand rule is used to find the direction of the ?

  1. Alternate current
  2. Direct current
  3. Induced current
  4. Actual current

Q.10:- What is the most commonly used substance in fluorescent tubes ?

  1. Sodium oxide and argon
  2. Sodium vapour and neon
  3. Mercury vapour and argon
  4. Mercury oxide and neon

Q.11:- A transformer works with ?

  1. Alternating current
  2. Direct current
  3. Both AC and DC
  4. Any signal
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Q.12:- A substance which radiates light when heated to a light temperature is said to be ?

  1. Luminescent
  2. Incandescent
  3. Fluorescent
  4. 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 ?

  1. Charge is transferred from your body to the handle
  2. The temperature of the human body is higher than of the handle
  3. A chemical reaction occurs when you touch the handle
  4. The human body and the handle arrive at thermal equilibrium by the process

Q.14:- A fuse wire is always connected to the ?

  1. Line wire
  2. Earth wire
  3. Neutral wire
  4. None of these

Q.15:- Ampere rule is used to find the ?

  1. Direction of current
  2. Direction of magnetic field
  3. Direction of motion of the conductor
  4. None of these

Q.16:- Alternating current can be measured by ?

  1. Moving coil galvanometer
  2. Hot wire ammeter
  3. Tangent galvanometer
  4. None of these

Q.17:- The frequency of AC main in India is ?

  1. 100 Hz
  2. 50 Hz
  3. 1/100 Hz
  4. 1/50 Hz

Q.18:- Photoelectric effect can be explained by assuming that light ?

  1. Is a form of transverse wave
  2. Is a form of longitudinal wave
  3. Can be polarised
  4. Consists of quanta

Q.19:- The unit of electrical power is ?

  1. Volt
  2. Watt
  3. Kilowatt Hour
  4. Ampere

Q.20:- Instrument used to store the electric charge is known as ?

  1. Inductor
  2. Capacitor
  3. Transformer
  4. Transistor

Q.21:- Ohm’s law does not apply to which of the following ?

  1. C. Circuits
  2. Conductors
  3. Semi Conductors
  4. None of these

Q.22:- A fuse wire is made of ?

  1. An alloy of Tin and Copper
  2. An alloy of Tin and Lead
  3. An alloy of Tin and Aluminium
  4. An alloy of Nickel and Chromium
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Q.23:- Fluorescent tubes are fitted with a choke. The choke coil ?

  1. Steps up the line voltage
  2. Steps down the line voltage
  3. Reduces current in the circuit
  4. Chokes low frequency current

Q.24:- Domestic electric wiring is basically a ?

  1. Series connection
  2. Parallel connection
  3. Combination of series and parallel connections
  4. Series connection within each room and parallel connection elsewhere

Q.25:- The phenomenon of electromagnetic induction implies a production of induced ?

  1. Resistance in a coil when the magnetic field changes with time
  2. Current in a coil when a electric field changes with time
  3. Current in a coil when a magnetic field changes with time
  4. Voltage in a coil when a magnetic field changes with time

 

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