Q1. The colour of the star is an indication of its
(a) distance from earth
(d) distance from the sun
Q2. At which temperature the centigrade and Fahrenheit scales are equal?
Q3. Match List-I with List-II and select the correct answer using the codes given below the lists:
A. Wavelength 1. Hertz
B. Energy 2. Angstrom
C. Intensity of sound 3. Joule
D. Frequency 4. Decibel
A B C D
(a) 2 3 4 1
(b) 1 2 3 4
(c) 2 3 1 4
(d) 2 1 3 4
Q4. A piece of ice is floating in a beaker containing water. When whole of the ice melts
(a) the level of water will come down.
(b) the level of water will come up.
(c) the level of water will first rise and then fall.
(d) the level of water will remain the same.
Q5. An iron needle sinks in water whereas a ship made of iron floats on it because
(a) the edge of the needle is pointed
(b) the ship is flat
(c) the ship is driven by powerful engine
(d) specific gravity of the needle is greater than that of water displaced by it.
Q6. Which one of the following statements is NOT correct?
(a) The velocity of sound in air increases with the increase of temperature.
(b) The velocity of sound in air is independent of pressure.
(c) The velocity of sound in air decreases as the humidity increases.
(d) The velocity of sound in air is not affected by the change in amplitude and frequency.
Q7. A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is—
(b) balanced by the force of attraction due to moon
(c) equal to centripetal force
(d) non-effective due to particular design of the satellite
Q8. Consider the following statements:
1. Two persons on the surface of moon cannot talk to each other.
2. Sound waves cannot travel through vacuum.
3. Speed of sound is greater in solid medium than in liquid or gas medium.
(a) 3 alone is correct
(b) 1 and 2 are correct
(c) 1 and 3 are correct
(d) 1, 2 and 3 are correct
Q9. According to Coulomb’s law, the electrostatic force between two charges is
(a) inversely proportional to the product of the charges
(b) inversely proportional to the square of the distance between the charges
(c) directly proportional to the cube of the distance between charges
(d) none of these
Q10. Which of the following is not correctly matched?
(a) Voltmeter — Potential difference
(b) Ammeter — Electric current
(c) Potentiometer — E.M.F.
(d) Galvanometer — Electric resistance
Q11. Choose the incorrect option?
(a) A bulb in an electric circuits glows due to heating effect of current.
(b) Tin cans, used for storing food are made by electroplating tin on to iron
(c) When the cells are connected in series, the resultant voltage is equal to sum of the individual voltage of the cells
(d) None of these
Q12. The sun is seen before the actual sunrise because of ….. .
(c) scattering of light
(d) rectilinear propagation of light
Q13. A liquid drop tends to assume a spherical shape because of
(a) surface tension
(b) viscous force
(c) gravitational force
(d) centrifugal force
Q14. Scent sprayer is based on
(a) Charles’s law
(b) Boyle’s law
(c) Archimedes’ principle
(d) Bernoulli’s principle
Q15. The reason of mirage is
(a) interference of light
(b) diffraction of light
(c) polarisation of light
(d) total internal reflection of light