131 Q) A space ship is from earth to moon and back. The greatest energy required for the spaceship is to overcome the difficulty in
(a)Entering the earth's gravitational field
(b) entering the moon's lunar surface
(c)take off from the lunar surface
(d)take off the Earth's field
132 Q) Half portion of a rectangular piece of ice is wrapped with a white piece of cloth while the other half with black one. In this context, which one of the following statements is correct?
(a)Ice melts more easily under white cloth
(b)Ice melts more easily under black cloth
(c)No ice melts at all under the white cloth
(d)No ice melts at all under the black cloth
133 Q) "Consider the following statements
I. Electrons are universal constituents of matter.
II. J.J. Thomson received the very first Nobel Prize in physics for discovering the electron.
III. The mass of an electron is about 1/2000 that of neutron.
IV. According to Bohr the linear momentum of the electron is quantised in the Hydrogen atom.
Which of the statements given above are correct?."
(a)I, II, III and IV
(b) I, II and III
(c) II and III
(d) III and IV
134 Q) "A table cloth can be pulled from a table without dislodging the dishes. It is because of
"
(a) Graham's law of diffusion
(b) Archimede's principle
(c) Newton's first law
(d) Newton's^ second law
135 Q) "Which one of the following instruments is used by the submarine sailors to see the objects on the surface?.
"
(a)Telescope
(b)Microscope
(c) Gyroscope
(d)Periscope
136 Q) "Which one of the following phenomena is associated with the fire flies giving cold light in night?.
"
(a)Fluorescence
(b) Phosphorescence
(c)Chemiluminescence
(d)Effervescence
137 Q) "A cyclotron can accelerate
"
(a) Ions
(b)Atoms
(c) Neutrons
(d)Gamma rays
138 Q) "The focal length of convex lens is
"
(a) the same for all the colours
(b) shorter for blue light than for red
(c) shorter for red light than for blue
(d) maximum for yellow light
139 Q) "A person is standing on a rotating stool spreading his arms. What will happen if he suddenly contracts his arm?
"
(a)His angular momentum increases
(b)His moment of inertia increases
(c)His moment of inertia decreases
(d)His angular momentum decreases
140 Q) "In terms of magnetic properties, oxygen belongs to
"
(a)magnetic materials
(b)ferromagnetic materials
(c)paramagnetic materials
(d)diamagnetic materials
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