Which car, moving from rest, has an average acceleration of 2.0 m s–2?
A A car reaching a speed of 10 m s–1 in 2 s.
B A car reaching a speed of 20 m s–1 in 5 s.
C A car reaching a speed of 30 m s–1 in 10 s.
D A car reaching a speed of 40 m s–1 in 20 s.
what is full meaning of 2.0 m sâ2 and give the answer of this question.
Select the correct sequence of words to fill the blanks in the following sentences.
(A) fibres do not absorb sweat.
(B) and wear white coats.
(C) is the national dress of Korea.
Which of the following changes is different from the other three?
AOpening of the lid of a bottle jar on submerging in hot water.
BBreaking of telephone wires hung overhead on poles in cold weather.
CCracking of a thick-walled glass when hot water is poured into it rapidly.
DBuckling of railway lines.
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)