Available Answers

1. 1.

   Write Tick (√) the correct option.

   1. Atmospheric pressure of a place depends on its
      1. temperature
      2. depth
      3. altitude
      4. Atmosphere
   2. Rolling friction is _______________ sliding friction.
      1. smaller than
      2. larger than
      3. equal to
      4. none of these
   3. Human ear can hear the sound in the frequency range of
      1. 20-30,000 Hz
      2. 20-20,000 Hz
      3. 20-25,000 Hz
      4. 20-15,000 Hz
   4. The impurities that collect below the anode are called
      1. cathode mud
      2. electrical mud
      3. ionic mud
      4. anode mud
   5. The rays of light that get reflected by the mirror are called
      1. incident rays
      2. reflected rays
      3. refracted rays
      4. normal
   6. The branch of Science that deals with the earthquakes and related phenomena is called
      1. earthquakology
      2. climatology
      3. seismology
      4. none of these
   7. These don't have light of their own.
      1. stars and moon
      2. planets and moon
      3. stars and planets
      4. stars, planets and moon.
   8. Which of the following is a renewable source of energy?
      1. Wind
      2. Coal
      3. Water
      4. Nuclear
2. 2.

   Correct the incorrect statements.

   1. Pressure decreases with depth.
   2. Force of friction is more on smooth surfaces.
   3. The number of oscillations per second is called the frequency of oscillation.
   4. Pure water is a good conductor of electricity.
   5. Reflections are regular when the beam of light falls on a smooth surface like a mirror.
   6. Like charges attract each other.
   7. Jupiter is the largest planet of the solar system.
   8. Oxygen is a greenhouse gas.
3. 3.

   What is gravitational force?

4. 4.

   Mention the advantages and disadvantages of friction?

5. 5.

   Mention the characteristics of sound.

6. 6.

   Mention the various uses of electroplating.