A particle starting from rest moves in a circle of radius 'r'. It attains a velocity of m/s on completion of n rounds. Its angular acceleration will be:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo bullets are fired horizontally and simultaneously towards each other from rooftops of two buildings (building being 100 m apart and being of the same height of 200 m) with the same velocity of 25 m/s. When and where will the two bullets collide? (g = 10 m/)?
1. after 2s at a height of 180 m
2. after 2s at a height of 20 m
3. after 4s at a height of 120 m
4. they will not collide.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo particles A and B are moving in a uniform circular motion in concentric circles of radii with speeds respectively. Their time periods of rotation are the same. The ratio of angular speed of A to that of B will be:
1. 1: 1
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe speed of a swimmer in still water is 20 m/s. The speed of river water is 10 m/s and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should make his strokes with respect to north is given by:
1. 45 west of north
2. 30 west of north
3. 0 west of north
4. 60 west of north
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA car turns at a constant speed on a circular track of radius 100 m, taking 62.8 s for every circular lap. The average velocity and average speed for each circular lap, respectively, is :
1. 0,0
2. 0, 10 m/s
3. 10 m/s, 10 m/s
4. 10 m/s, 0
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFor a projectile projected at angles (45°-θ) and (45°+θ), the horizontal ranges described by the projectile are in the ratio of:
1. 1:1
2. 2:3
3. 1:2
4. 2:1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are (, 3). The path of the particle makes an angle of .......................with the x-axis :
1. 30o
2. 45o
3. 60o
4. 0o
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA particle of mass m is projected with velocity v making an angle of 45° with the horizontal. When the particle lands on the level ground, the magnitude of change in its momentum will be:
1.
2.
3.
4. zero
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA particle has initial velocity and has acceleration . Its speed after 10 s is
1. 7 units
2. 7units
3. 8.5 units
4. 10 units
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA missile is fired for a maximum range with an initial velocity of 20 m/s. If g= 10 m/s2, then the range of the missile will be
1. 50 m
2. 60 m
3. 20 m
4. 40 m
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology