class 11 phy ch1

Consider the motion of the second hand of a clock. In one minute(R be the length of the second hand) it's...

• Displacement is zero

• Distance covered is 2R

• Distance covered is zero

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The position of a body moving along x-axis at time t is given by x=(t²-4t+6). The distance covered between t=0 and t=3:

• 5 meters

• 7 mts

• 400 cms

• 0.03kms

If a particle is moving along a straight line with increasing speed, then

• It's acceleration may be decreasing

• It's acceleration is negative

• It's acceleration is positive

• It's acceleration is zero

If velocity and acceleration are 'v' and 'a' respectively. the speed of the particle is increasing if

• v<0, a>0

• v>0, a>0

• v>0, a<0

• v>0, a=0

For a body v_avg = speed_avg then,

• The particle must move with non-zero acceleration

• The particle must move in a straight line without turning back

• The particle must be at rest

• The particle must move with zero acceleration

If a body is moving with constant speed, it's acceleration

• May be uniform

• Must be zero

• May be variable

• All of the above

the position of a particle on the x-axis is given by x=10t-2t² find 't' where 'x' will be momentarily zero

• 500ms

• 100ms

• 2.5s

• 10s

the ratio of displacement : distance for a moving object is 'R' then

• R=1

• R<1

• R>1

• R<=1

• x>0, v<0, a>0

• x<0, v<0, a>0

• x>0, v>0, a>0

• x<0, v>0, a<0

• Quantity B may represent time

• Quantity A is velocity if motion is uniform

• Quantity A is displacement if motion is uniform

• Quantity A is velocity if motion is uniformly accelerated