A body can have consutant velocity when it follows a

1.elliptical path

2.circular path

3.parabolic path

4.rectilinear path

A cyclist cycling around a circular racing track skids because

1.the centripetal force upon him is less than limiting friction

2.the centripetal force upon him is greater then limiting friction

3.the centripetal force upon him is equal to the limiting friction

4.the friction between the tyres of the cycle and road vanishes

A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is

1.mg

2.mg - ma

3.mg + ma

4.mg - ma

If a body of mass 10 kg is allowed to fall freely its weight becomes

1.zero

2.89N

3.9.8 N

4.10N

Minimum number of communication satellites required to cover the whole carth is

1.4

2.3

3.2

4.5

The angular speed for daily rotatio of earth in rad S-1 is

1.2 ?

2. ?

3.4 ?

4.7.3 x 10-5 rads-1

The shaft of a motor rotates at a constant angular speed of 360rev/min. Angle turned through in 1 sec in radian is

1.?

2.3?

3.6?

4.12?

What is outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s?

1.1N

2.10N

3.2N

4.100N

A hoop and disc have same mass and radius. Their rotational K.E are related by an equation

1. K.Ehoop = K.Edisc

2.K.Ehoop = 2K.Edisc

3.K.Ehoop = 1/2K.Edisc

4.K.Ehoop = 4K.Edisc

According to Einstein the gravity interaction is possible between

1.material objects only

2.material objects and electromagnetic radiation only

3.electromagnetic radiations

4.none of the above

Angular speed of seconds hand of a watch in rads-1 is

1.?

2.?/2

3.?/30

4.?/180

Geo-stationary satellite completes one rotation around earth in

1.3 hours

2.6 hours

3.12 hours

4.24 hours

If a car moves with a uniform speed of 2 ms-1 in a circle of radius 0.4. Its angular speed is

1.4 rad. S-1

2.5 rad. S-1

3.1.6 rad. S-1

4.2.8 ms-1

One radian is equal to

1.67.3?

2.57.3?

3.87.3?

4.60?

Radius of geo-stationary orbit from center of earth is nearly

1.42000km

2.36000km

3.24000 km

4.18000 km

The critical speed of an artificial satellite is

1.8 Kms-1

2.8.1 Kms-1

3.7.9 Kms-1

4.8 ms-1

The direction of linear velocity of body moving in a circle is

1.along the axis of rotation

2.along the tangent

3.directed towards the center

4.directed away form the center

The period of a circular motion is given by

1.T = rV

2.T = ?w

3.T = 2??

4.T = 2?/?

The rotational K.E of hoop is equal to the

1.its translational K.E

2.half than its translational K.E

3.double than its translational K.E

4.four times than its translational K.E

When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by

1.mass of a body

2.velocity of body

3.tension in the string

4.centripetal acceleration

When a body moves in a circle the angle between its linear velocity and angular velocity is always

1.180?

2.0?

3.90?

4.45?

Who discovered the inverse square law for gravity?

1.Einstein

2.Galileo

3.Newtons

4.Plank

A body moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R the ration of displacement to the covered path will be

1.? R

2.2? R

3.zero

4.4? R

A body of 2 kg is suspended form the ceiling of an elevator moving up with an acceleration g. Its apparent weight in the elevator will be

1.9.8 N

2.19.6 N

3.129.4 N

4.39.2 N

A satellite moving round the earth constitutes

1.An inertial frome of reference

2.non inertial frame

3.neither inertial nor non inertial

4.both inertial and non inertial

A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position the tension in the string is

1.maximum

2.zero

3.equal to the weight of the stone

4.less than the weight of the stone

Centripetal force performs

1.maximum work

2.minimum work

3.negative work

4.no work

How many days would be in a year if the distance between the earth and the sun were reduced to half of its present value (assuming circular orbit)?

1.365 days

2.730 days

3.329 days

4.129 days

If a wheel of radius r turns through an angle of 30? then the distance through which any point on its rim moves is

1.? /3 x r

2.?/6 x r

3.?/30 x r

4.? / 180 x r

If we whirl a stone at the end of a string in the vertical circle it is likely to break when the stone is

1.at the highest point

2.at the lowest point

3.at any point during motion

4.at the point where gravity is not acting

In angular motion Newtons second law of motion is

1.F=ma

2.F=?p/?t

3.? = 1a

4.all above

In case of planets the necessary acceleration is provided by

1.Gravitational force

2.frictional force

3.coulomb force

4.centripetal force

moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R the ratio of displacement to the covered path will be

1.??R

2.2??R

4.4??R

The circumference subtends an angle

1. radianradian

2.2? radian

3.?/2 radian

4.4? Radian

The planet nearest to the earth is

1.Venus

2.Mercury

3.Uranus

4.Sun

The relation between linear and angular acceleration is

1.a = a x r

2.a = r x a

3.a = a x r

4.r = a x a

The span of broad jump depends upon

1.mass of the jumper

2.height of jump

3.angle of projection

4.none

When a body is moving along a circular path it covers a certain angle in a given internal of time. Such type of motion is

1.vibratory motion

2. linear motion

3.rotatory motion

4. angular motion

When a body moves in a circle of radius r with linear speed V its centripetal force is

1.mV/r2

2.mV/r

3.mV2/r

4.mV2/r2

When a wheel 1 m in diameter makes 30 rev min the linear speed of point on its rim in ms-1 is

1.2?

2.?/2

3.?

4.20?

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