Q1. Dynamo is a device for converting
(a) Heat energy into electrical energy
(b) Mechanical energy into electrical energy
(c) Magnetic energy into electrical energy
(d) Chemical energy into electrical energy
Q2. Oil rises up the wick in a lamp because
(a) Oil is very light
(b) Of the diffusion of oil through the wick
(c) Of the surface tension phenomenon
(d) Of the capillary action phenomenon
Q3. In the atmosphere ultraviolet rays are absorbed by
(a) Oxygen
(b) Nitrogen
(c) Ozone
(d) Helium
Q4. Which of the following metals is used for the manufacture of heating elements provide in electric iron ?
(a) Nickel
(b) Chromium
(c) Nichrome
(d) Tungsten
Q5. An electron microscope gives higher magnification than an optical microscope, because
(a) it uses more powerful lenses
(b) the velocity of electron is smaller than that of visible light
(c) the electrons have more energy than the light particles
(d) the wavelength of electrons is smaller as compared to the wavelength of visible light
Q6. The hydraulic brakes used in automobiles is a direct application of :
(a) Archimedes’ principle
(b) Toricellian law
(c) Bernoulli’s theorem
(d) Pascal’s law
Q7. Where are mesons found ?
(a) Cosmic rays
(b) X-rays
(c) Gamma rays
(d) Laser beam
Q8. Plants are dried up in winter due to front because
(a) Evaporation does not take place
(b) Photosynthesis does not take place at such low temperature
(c) Respiration does not take place at low temperature
(d) There is mechanical loss of tissues and drought condition prevails
Q9. For a body moving with non-uniform velocity and uniform acceleration
(a) Displacement– Time graph is linear
(b) Displacement– Time graph is non-linear
(c) Velocity– Time graph is nonlinear
(d) Velocity– Time graph is linera
Q10. The fourth state of matter is know as
(a) Gas
(b) Vapour
(c) Plasma
(d) Electrons
Solutions
S1. Ans.(b)
S2. Ans.(d)
S3. Ans.(a)
S4. Ans.(c)
S5. Ans.(d)
S6. Ans.(d)
S7. Ans.(a)
S8. Ans.(d)
S9. Ans.(b)
S10. Ans.(c)
