121 The periodic alternation of sound between maximum and minimum loudness are called___________________? Physics Medium Full question → A silence zone B interference C beats D resonance
122 The velocity of sound in air would become double than its velocity at 0°C at temperature________________? Physics Medium Full question → A 313°C B 586°C C 819°C D 1172°C
123 The normal ear is the most sensitive in the frequency range___________________? Physics Medium Full question → A 20000 to 30000 hertz B 10 to 20 hertz C 2000 to 4000 hertz D 6000 to 8000 hertz
124 On loading the prong of a tuning form with wax its frequency____________________? Physics Medium Full question → A increases B decreases C remains unchanged D may increase or decrease
125 Increase in velocity of sound in the air for 1°C rise in temperature is_________________? Physics Medium Full question → A 1.61 ms-1 B 61.0 ms-1 C 0.61 ms-1 D 2.00 ms-1
126 Sound waves do not travel in vacuum because ___________________? Physics Medium Full question → A they are transverse waves B they are stationary waves C they require material medium for propagation D they do not have enough energy
127 When arrow is released form its bow, its energy is transformed from _____________________? Physics Medium Full question → A heat energy to K.E B elastic P.E to K.E C elemical energy to elastic P.E D K.E to elastic P.E.
128 If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is ___________________? Physics Medium Full question → A 1600 ms-1 B 50.6 ms-1 C 71.6 ms-1 D 2263ms-1
129 The escape velocity form the earth surface in km S-1 is____________________? Physics Medium Full question → A 4.2 km S-1 B 7.5 km S-1 C 9.5 km S-1 D 1.1 km S-1
130 The consumption of energy by a 60 watt bulb in 2 sec is_________________? Physics Medium Full question → A 120 J B 60 J C 30 J D 0.02 J
131 Which of the following is not conservative force_________________? Physics Medium Full question → A friction B electric C gravitational D magnetic
132 If velocity is doubled then__________________? Physics Medium Full question → A momentum increases 4 times and K.E increases 2 times B momentum and K.E. remain same C momentum increases 2 times and K.E increases constant D momentum increases 2 times and K.E increases 4 time
133 Work done by the force of friction is____________________? Physics Medium Full question → A always positive B always negative C positive only for small frictional force D positive only for large frictional force
134 The source of geothermal energy is___________________? Physics Medium Full question → A decay of radioactive element in the earth B compression of material in the earth C residual lost of the earth D all as said in A – B and C
135 The escape velocity of a body in gravitational field of earth is independent of__________________? Physics Medium Full question → A its mass B the angle at which it is thrown C both its mass and the angle at which it is thrown D gravitational field of earth
136 Work done by variable force is determine by dividing____________________? Physics Medium Full question → A force into small interval B displacement into small interval C both force and displacement into small intervals D force into small and displacement into large intervals
137 Proton electron neutron and a particles have same momentum. Which of them have highest K.E ? Physics Medium Full question → A Proton B electron C neutron D a-particle
138 The average power and instantaneous power become equal if work is done at __________________? Physics Medium Full question → A any rate B at variable rate C at uniform rate D at high rate
139 If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________? Physics Medium Full question → A 38.2 J B 392.1 J C 39.2 J D 3.92 J
140 When a force is parallel to the direction of motion of the body, then work done on the body is_____________________? Physics Medium Full question → A zero B minimum C infinity D maximum