Q. When an object is heated, the molecules of that object :
1) began to move faster
2) lose energy
3) become heavier
4) become lighter
Q. The charge on an electron is -
1) + 1.6 x 10-19 Coulomb
2) -1.6 x 10-19 Coulomb
3) +1.9 x 10-16 Coulomb
4) -1.9 x 10-16 Coulomb
Q. In human eye, the image of an object is formed at -
1) Cornea
2) Iris
3) Retina
4) Pupil
Q. The splitting of light into its component colours is called -
1) Reflection
2) Refraction
3) Dispersion
4) Polarization
Q. Which of the following is not correct for the image formed by a plane mirror ?
1) Image is always virtual
2) Image is always real
3) Image is always erect
4) Size of image is equal to that of object
Q. When an object is at infinity, the position of the image formed by a concave mirror is at -
1) Focus of the mirror
2) Centre of curvature of the mirror
3) Infinity
4) Behind the mirror
Q. Electric motor works on the principle of -
1) Electromagnetic induction
2) Newton's law
3) Ohm's law
4) Bio-Savart's law
Q. Unit of magnetic flux is -
1) Tesla
2) Gauss
3) Weber
4) Coulomb
Q. What property stays the same during physical and chemical changes in a closed system ?
1) Density
2) Shape
3) Mass
4) Arrangement of particle
Q. Which one of the following intruments is used for measuring moisture content of air ?
1) Hydrometer
2) Hygrometer
3) Hypsometer
4) Pycnometer
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