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11th Standard Physics English Medium Free Online Test 1 Mark Questions 2020 - Part Ten

11th Standard

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Physics

Time : 00:25:00 Hrs
Total Marks : 25

    Answer all the questions

    25 x 1 = 25
  1. If the force is proportional to square of velocity, then the dimension of proportionality constant is

    (a)

    [MLT0]

    (b)

    [MLT-1]

    (c)

    [MLT-2T]

    (d)

    [MLT-1T0]

  2. If the error in the measurement of radius of a sphere is 3% then the error in the measurement of volume of the sphere will be:

    (a)

    4%

    (b)

    6%

    (c)

    2%

    (d)

    9%

  3. Random error can be eliminated by

    (a)

    careful observation

    (b)

    eliminating the cause

    (c)

    taking mean

    (d)

    measuring with more than one instrument

  4. The pressure on a square plate is measured by measuring the force on the plate and the length of the sides of the plate by using the formula p =\(F\over l^2\) .If the maximum errors in the measurement of force and length are 4% and 2% respectively, then the maximum error in the measurement of pressure is _________________

    (a)

    1%

    (b)

    2%

    (c)

    8%

    (d)

    10%

  5. Slope of displacement-time graph at any instant gives:

    (a)

    speed

    (b)

    acceleration

    (c)

    retardation

    (d)

    velocity

  6. Apassenger in the moving train throws a coin. If the coin falls in front of him, train must be moving with:

    (a)

    uniform speed

    (b)

    acceleration

    (c)

    deceleration

    (d)

    uniform velocity

  7. An aeroplane moving horizontally with a speed of 180 kmhr-1 drops a food packet while flying at a height of
    490 m. rille horizontal range of the food packet is

    (a)

    500m

    (b)

    200m

    (c)

    650m

    (d)

    925m

  8. If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is

    (a)

    ut

    (b)

    \({1\over 2}gt^2\)

    (c)

    ut-\({1\over 2}gt^2\)

    (d)

    (u+gt)t

  9. If two objects A and B are moving along a straight line in the same direction with the velocities VA and VB respectively, then the relative velocity is

    (a)

    VA + VB

    (b)

    VA - VB

    (c)

    VAVB

    (d)

    VA/VB

  10. Two masses m1 = 2 kg and m2 = 1 kg are connected by a string which passes over a smooth frictionless pulley. The acceleration of the masses when they are released is,

    (a)

    3.26 ms-2

    (b)

    2.26 ms-2

    (c)

    1.26 ms-2

    (d)

    4.26 ms-2

  11. A machine gun has mass 15 kg. It fires 15 g bullet at the rate of 200 bullets per minutes with a speed of 150 m/s. Then the recoil velocity of the gun is,

    (a)

    20 ms-1

    (b)

    15 ms-1

    (c)

    150 ms-1

    (d)

    0.2 ms-1

  12. In non inertial frame, the second law of motion is written as

    (a)

    F = ma

    (b)

    F = ma + Fp

    (c)

    F = ma - Fp

    (d)

    F = 2ma

  13. A rider on horse fall back when horse starts running all of a sudden because

    (a)

    rider is taken back

    (b)

    rider is suddenly afraid of falling

    (c)

    inertia of rest keeps the upper part of body at rest whereas lower part of the body moves forward with the horse

    (d)

    none of these

  14. A book is lying on the table. What is the angle between the action of the book on the table and the reaction of the table on the book?

    (a)

    (b)

    450

    (c)

    900

    (d)

    1800

  15. First law of Newton deals with the:

    (a)

    concept of inertia alone

    (b)

    definition of force alone

    (c)

    either (a) or (b)

    (d)

    concept of inertia and definition of force

  16. In Newton's second law \(\vec { F } =m\bar { a } \) (for constant mass m), \(\vec { a } \) is the acceleration of the mass m with respect to:

    (a)

    any observer

    (b)

    any inertial observer

    (c)

    an observer at rest only

    (d)

    an observer moving with Uniform speed only

  17. Newton's second and third laws of motion lead to the conservation of:

    (a)

    linear momentum

    (b)

    angular momentum

    (c)

    potential energy

    (d)

    kinetic energy

  18. Recoil of a gun is in accordance with:

    (a)

    conservation of masses

    (b)

    conservation of momentum

    (c)

    Newton's third law of motion

    (d)

    all the above

  19. A body of imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then:

    (a)

    the body will necessarily change direction

    (b)

    the body is sure to slow down

    (c)

    the body will necessarily continue to move in the same direction at the same speed

    (d)

    none of these

  20. When two surfaces are coated with a lubricant, then they:

    (a)

    stick to each other

    (b)

    slide upon each other

    (c)

    roll upon each other

    (d)

    none of these

  21. A cyclist bends while taking turn to:

    (a)

    reduce friction

    (b)

    generate required centripetal force

    (c)

    reduce apparent weight

    (d)

    reduce speed

  22. When a particle is in uniform motion it does not have

    (a)

    radial velocity and radial acceleration

    (b)

    radial velocity and transverse acceleration

    (c)

    transverse velocity and radial acceleration

    (d)

    transverse velocity and transverse acceleration

  23. The blocks of masses m and M connected by a spring are kept on a smooth horizontal frictionless table. A force f is applied to the mass M. If the acceleration of mass m is 'a' the acceleration of mass M will be

    (a)

    \(\frac { am }{ M } \)

    (b)

    \(\frac { F }{ M } \)

    (c)

    \(\frac { (F+ma) }{ M } \)

    (d)

    \(\frac { (F-ma) }{ M } \)

  24. An object of mass 10 kg is hanging on a spring scale which is attached to the roof of a lift. If the lift is in free fall, the reading in the spring scale is

    (a)

    98 N

    (b)

    zero

    (c)

    49 N

    (d)

    9.8 N

  25. An air column in a pipe which is closed at one end, will be in resonance with the vibrating body of frequency 83Hz. Then the length of the air column is

    (a)

    1.5 m

    (b)

    0.5 m

    (c)

    1.0 m

    (d)

    2.0 m

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