Anil and Brij are hammering a nail into two pieces of wood to join them. Sunita covered her ears, because she said that hammering is noisy. She told them that they are wasting energy because most of the energy they used in hammering is getting lost. Anil disagreed with what Sunita said. Brij explained that some of the energy is converted to sound and heat, but not lost. Anil then added that energy can never be lost or destroyed.
Who among Anil, Brij and Sunita is/are right?
DAnil and Brij only
Communicable diseases pass from one person to another through different modes of transmission. Which disease cannot spread through the mode of transmission as shown in the given figure?
Kavita wanted to toast some bread with the electric toaster. When she switched on the toaster, she received a mild electric shock. However, when her sister Komal tried the same, she did not feel any shock. What could be the possible reason for the difference in their experiences?
(i) Kavita's hands were wet but Komal's hands were dry.
(ii) Kavita was barefoot but Komal was wearing a pair of rubber slippers.
(iii) Kavita's body was a better conductor of electricity than Komal's.
A(i) and (ii) only
B(i) and (iii) only
C(ii) and (iii) only
D(i), (ii) and (iii)
Refer to the given Venn diagram and select the incorrect statement regarding P, Q and R.
A R has three pairs of jointed legs which help it to walk, run and climb.
B Q has paired and unpaired fins that help in movement in water.
C P has special air sacs connected to the lungs which aid in respiration process.
D Q is a shelled animal that possesses a muscular structure called foot which produces a series of wave like movements, pushing its body forward.
As per the question the animal Q is an shelled animal because it have endoskeletonSo the option D should be correct.
The given graph shows the temperature changes when a sample of ice is heated. What is happening at point 1?
A The liquid is evaporating.
B The liquid is freezing.
C The solid is freezing.
D The solid is melting.