'An object may be in the rest as well as in the motion at the same time'. Which one of the following is correct explanation for the above statement?
A Rest and motion are defined on basis of position of an object. So a body may be in rest and in the motion at the same time.
B Object is in rest or in motion depends on the reference point. An object may be in motion with respect to a reference point and at same time the object may be in rest with respect to another reference point.
C Rotatory motion justifies the above statement. In the rotatory motion, object rotates around a fixed axis and does not cover distance. Therefore, object is in motion and in the rest at the same time.
D No, it is not possible that an object is in the motion and in the rest as well.
A marble tile would feel cold as compared to a
wooden tile on a winter morning, because the
A is a better conductor of heat than the wooden tile.
B is polished while wooden tile is not polished.
C reflects more heat than wooden tile.
D is a poor conductor of heat than the wooden tile.
Marble reflects more heat .So it will radiate less heat in winter.
A boy rolls a rubber ball on a wooden surface. The ball travels a short distance before coming to rest. To make the same ball travel longer distance before coming to rest, he may
A spread a carpet on the wooden surface.
B cover the ball with a piece of cloth.
C sprinkle talcum powder on the wooden surface.
D sprinkle sand on the wooden surface.
Which of the following is false?
A We wear white to keep ourselves warm during winter.
B We wear white to keep ourselves cool during summer.
C Aluminium foils are used to keep food warm.
D Pipes are painted black to minimise transfer of thermal energy.
answer is showing Dbut A is also false
Which one of the following is true for the uniform speed?
A If speed of the object varies at different interval of time, the object has uniform speed.
B If speed of the object is constant at different intervals of time, the object has uniform speed.
C If a moving object suddenly comes to rest, the object has uniform speed.
D None of these.
Answer is showing option - BBut it should be ---- If speed of the object is equal at equal intervals of time , the object has uniform speed
A particle moves on a circular path of radius R as shown in the figure. Study the figure and answer the following questions.
The distance travelled and displacement of the particle from A to C respectively are
A πR/2, 2R
B π, 2R
C πR/2, πR/2
D πR, πR
Options provided are all wrong