OMT 2n lesson (FOR TOPPERS)

11th Standard

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Physics

Time : 00:30:00 Hrs
Total Marks : 30
    I.CHOOSE THE BEST ANSWER.
    30 x 1 = 30
  1. The angle between A i +j and B = i - j is

    (a)

    45°

    (b)

    90°

    (c)

    -45°

    (d)

    180°

  2. Consider the quantities pressure, power, energy, impulse, charge. Out of these, the only vector quantity is

    (a)

    pressure

    (b)

    power

    (c)

    impulse

    (d)

    charge

  3. The length of a vector is _______________

    (a)

    always a negative quantity

    (b)

    always a positive quantity

    (c)

    either positive or negative

    (d)

    denoted by '\(\lambda \)

  4. Distance is a scalar quantity and ______________ is a vector.

    (a)

    Speed

    (b)

    Length

    (c)

    Time

    (d)

    Displacement

  5. Choose the motion in two dimension from the following.

    (a)

    Motion of a train along a straight railway track

    (b)

    An object falling freely under gravity close to the Earth.

    (c)

    A particle moving along a curved path in a plane.

    (d)

    Flying ofa kite on a windy day.

  6. A body is allowed to fall from a height of 100 m. If the time taken for the first 50m is t1, and for the remaining 50m is t2, then:

    (a)

    t1 = t2

    (b)

    t1 > t2

    (c)

    t1 < t2

    (d)

    depends upon the mass

  7. The velocity of a particle at an instant t is l0 m/s. After 5 s the velocity is 20 m/s. The velocity, 3 seconds earlier was:

    (a)

    2 m/s

    (b)

    3 m/s

    (c)

    4 m/s

    (d)

    5 m/s

  8. The acceleration of a moving body can be found from:

    (a)

    area under velocity-time graph

    (b)

    area under distance-time graph

    (c)

    slope of the velocity-time graph

    (d)

    slope of distance-time graph

  9. The slope of the velocity-time graph for retarded motion is:

    (a)

    positive

    (b)

    negative

    (c)

    zero

    (d)

    can be positive, negative or zero

  10. A man wants to hit the target, he should point its rifle:

    (a)

    higher than target

    (b)

    lower than target

    (c)

    in the same direction

    (d)

    nothing can be said

  11. The time of flight is __________ the time taken to attain the maximum height:

    (a)

    thrice

    (b)

    same

    (c)

    twice

    (d)

    four times

  12. The angle of projection for a projectile to cover maximum range is:

    (a)

    30°

    (b)

    60°

    (c)

    (d)

    45°

  13. Which of the following is true regarding projectile motion?

    (a)

    horizontal velocity of projectile is constant

    (b)

    vertical velocity of projectile is constant

    (c)

    acceleration is not constant

    (d)

    momentum is constant

  14. The study of motion, without consideration of its cause is studied in______________.

    (a)

    statistics

    (b)

    kinematics

    (c)

    mechanics

    (d)

    modern physics

  15. Two vectors act along the mutually perpendicular directions are called______vectors.

    (a)

    equal

    (b)

    opposite

    (c)

    orthogonal

    (d)

    orthogonal unit

  16. If \(\bar A\)and \(\bar B\) denotes the sides of a parallelogram whose area is \(\frac{1}{1}\left| A \right|\left| B \right|\) the angle between \(\bar A\)and \(\bar B\) is:

    (a)

    60°

    (b)

    450

    (c)

    30°

    (d)

    90°

  17. The angular speed of a fly-wheel making 120 revolutions/minute is:

    (a)

    \(\pi\) rad/sec

    (b)

    \(4\pi\) rad/sec

    (c)

    \(2\pi\) rad/sec

    (d)

    \(4\pi^2\) rad/sec

  18. A body is moving with a constant speed v in a circle of radius r. Its angular acceleration is:

    (a)

    vr

    (b)

    \(\frac{v}{r}\)

    (c)

    zero

    (d)

    \(\frac{v}{r^2}\)

  19. What is the angle between \(\hat i+\hat j+\hat k\) and \(\hat j\)?

    (a)

    (b)

    45o

    (c)

    60°

    (d)

    none of these

  20. Position-time graph for motion with negative acceleration is:

    (a)

    (b)

    (c)

    (d)

  21. An aeroplane is flying with a uniform, speed of 150 kmhr-1along the circumference of a circle. The change in its velocity in half the revolution (in kmhr-1)is

    (a)

    150

    (b)

    200

    (c)

    100

    (d)

    300

  22. A boy standing at the top of a tower of 20 m height drops a stone. Assuming g = 10 m S-2, the velocity with which it hits the ground is

    (a)

    10.0m/s

    (b)

    20.0m/s

    (c)

    40.0m/s

    (d)

    5.0m/s

  23. The radius of the earth was measured by

    (a)

    Newton

    (b)

    Eratosthenes

    (c)

    Galileo

    (d)

    Ptolemy

  24. Unit vector is

    (a)

    having magnitude one but no direction

    (b)

    \(A\vec A\)

    (c)

    \(\frac{\hat A}{A}\)

    (d)

    |A|

  25. \(\hat i\times \hat i\) is

    (a)

    0

    (b)

    1

    (c)

    \(\infty\)

    (d)

    \(\hat j\)

  26. An object is dropped from rest. Its v - t graph is

    (a)

    (b)

    (c)

    (d)

  27. Which of the following graph represents the equation y = mx - C?

    (a)

    (b)

    (c)

    (d)

  28. Which of the following graph represents the equation y = kx2?

    (a)

    (b)

    (c)

    (d)

  29. For a particle, revolving in a circle with speed, the acceleration of the particle is

    (a)

    along the tangent

    (b)

    along the radius

    (c)

    along its circumference

    (d)

    zero

  30. The angle for which maximum height and horizontal range are same for a projectile is

    (a)

    32o

    (b)

    48o

    (c)

    76o

    (d)

    84o

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