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11th Standard Physics English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Four

11th Standard

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Physics

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

    Answer all the questions

    25 x 1 = 25
  1. The dimensional formula for gravitational constant G is

    (a)

    [ML3T-2]

    (b)

    [M-1L3T-2

    (c)

    [M-1L-3T-2

    (d)

    [ML-3T-2

  2. High precision instruments are used to eliminate:

    (a)

    personal error

    (b)

    random error

    (c)

    chance error

    (d)

    least count error

  3. If the energy E = GPhqCr where G is the universal gravitational constant, h is the planck's constant and C is the velocity of light, then the values of p, q and r are respectively:

    (a)

    \(-{1\over2},{1\over2}and {5\over2}\)

    (b)

    \({1\over2},-{1\over2}and-{5\over2}\)

    (c)

    \(-{1\over2},{1\over2}and {3\over2}\)

    (d)

    \(-{1\over2},-{1\over2}and- {3\over2}\)

  4. A force F is applied on to a square plate of side L.If the percentage error in determining L is 2% and rhat in F is 4%, the percentage error in pressure is

    (a)

    8%

    (b)

    4%

    (c)

    6%

    (d)

    3%

  5. TIle dimensional formula of torque is

    (a)

    [ML2T-2]

    (b)

    [MLT-2]

    (c)

    [ML-1T-2]

    (d)

    [ML-2T-2]

  6. The study of production and propagation of sound waves________

    (a)

    Astrophysics

    (b)

    Acoustics

    (c)

    Relativity

    (d)

    Atomic physics

  7. Fundamental quantities can also be known as________quantities.

    (a)

    original

    (b)

    physical

    (c)

    negative

    (d)

    base

  8. The range of distance can be measured by using direct methods is________

    (a)

    10-2 to 10-5 m

    (b)

    10-2 to 102 m

    (c)

    102 to 10-5 m

    (d)

    10-2 to 105 m

  9. The maximum possible error in the difference of two quantities is___________.

    (a)

    Z=A+B

    (b)

    \(\triangle Z=\triangle A-\triangle B\)

    (c)

    \(\frac{\triangle Z}{Z}=\frac{\triangle A}{A}+\frac{\triangle B}{B}\)

    (d)

    \(\frac{\triangle Z}{Z}=\frac{\triangle A\triangle B}{AB}\)

  10. If a particle executes uniform circular motion in the xy plane in clock wise direction, then the angular velocity is in

    (a)

    +y direction

    (b)

    +z direction

    (c)

    -z direction

    (d)

    -x direction

  11. 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

  12. 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

  13. Electric charge is an example for_________quantity.

    (a)

    vector

    (b)

    fundamental

    (c)

    scalar

    (d)

    both (a) and (b)

  14. If the velocity of a particle is v= At + Bt2, where A and B are constants, then the distance travelled by it between I sand 2 s is

    (a)

    \({3\over2}A+{7\over3}B\)

    (b)

    \({A\over2}+{B\over3}\)

    (c)

    \({3\over2}A+4B\)

    (d)

    \(3A+7B\)

  15. If a car at rest accelerates uniformly to a speed of 144 krn/h in 20 sec, it covers a distance of

    (a)

    1440cm

    (b)

    2980cm

    (c)

    20m

    (d)

    400m

  16. A bus travelling the first one-third distance at a speed of 10 km/h, the next one-third at 20 km/h and at last one-third at 60 km/h. The average speed of the bus is

    (a)

    9km/h

    (b)

    16km/h

    (c)

    18km/h

    (d)

    48km/h

  17. If \(\hat n\) is a unit vector along the direction of \(\vec A\), the \(\hat n\) is

    (a)

    \(\vec AA\)

    (b)

    n x A

    (c)

    \(\frac{\vec A}{A}\)

    (d)

    \(\vec A|A|\)

  18. \(\hat i.\hat j\) is

    (a)

    0

    (b)

    1

    (c)

    \(\infty \)

    (d)

    none

  19. The vector product of two vectors will have maximum magnitude when \(\theta\) is equal to

    (a)

    0o

    (b)

    90o

    (c)

    180o

    (d)

    360o

  20. Two blocks of masses m and 2m are placed on a smooth horizontal surface as shown. In the first case only a force F1 is applied from the left. Later only a force F2 is applied from the right. If the force acting at the interface of the two blocks in the two cases is same, then F1 :F2 is

    (a)

    1:1

    (b)

    1:2

    (c)

    2:1

    (d)

    1:3

  21. While walking, the vertical component of reactive force balances our:

    (a)

    force

    (b)

    mass

    (c)

    weight

    (d)

    impulse

  22. Which one of the following motions on a smooth plane surface does not involve force?

    (a)

    accelerated motion in a straight line

    (b)

    retarded motion is a straight line

    (c)

    motion with constant momentum along a straight line

    (d)

    motion along a straight line with varying velocity

  23. A jet engine works on the principle of:

    (a)

    conservation of linear momentum

    (b)

    conservation of mass

    (c)

    conservation of energy

    (d)

    conservation of angular momentum

  24. If the linear momentum of the object is increased by 0.1% then the kinetic energy is Increased by

    (a)

    0.1 %

    (b)

    0.2 %

    (c)

    0.4 %

    (d)

    0.01 %

  25. When a mass is rotating in a plane about a fixed point, its angular momentum is directed along,

    (a)

    a line perpendicular to the plane of rotation

    (b)

    the line making an angle of 450 to the plane of rotation

    (c)

    the radius

    (d)

    tangent to the path

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