 # Multiple choice Question (MCQ) :- Physical World and Measurement and Dimensions of Physical Quantities.

## 1.Physical World:-

### Select the Right Choice

1. The number of base forces is

(a) 2     (b) 3            (c)4          (d) 6

2. The weakest core force is:

(a)  Gravitational force

(b)  electromagnetic force

(b)  strong nuclear force

(d)  attenuated(week) nuclear force

3. The most potent nuclear force is:

(a)  Gravitational force

(b)  electromagnetic force

(b)  strong nuclear force

(c)  Week nuclear force

4. Frictional forces are derived from:

(a)  Gravitational force

(b)  electromagnetic force

(c)  strong nuclear force

(d)  weak nuclear force

5. Strong nuclear force, than electromagnetic forces:

(a)  100 times weaker

(b)  100 times stronger,

(c)  106 times weaker
(d)  10 6 time stronger

6. When the external force on the body is zero, the conserved physical amount is:

(a)  mechanical energy

(b)  linear momentum

(c)  angular momentum

(d)  All of the above

7. When the force on the body is conserved, the physical amount conserved is:

(a)  Mechanical energy

(b)  linear momentum

(c)  angular momentum

(d)  All of the above

8. Physical amount is equal to mass.

(a)  energy

(b)  linear momentum

(c)  angular momentum

(d)  all of the above

9. The equivalent law of mass-energy is:

(1)  E = mc2

(b)  E =m/c2

(c)  E = mc

(d)  E = m/c

## 2.Measurement:-

1. S.I.The number of base units in the method is

(a)  3

(b)  6

(c)   7

(d)  9

2. Nanometer Equivalent

(a)  10 9  mm
(b)  10-6 cm

(d)  10-9cm

3. One micron is equal to:

(a)  10-9m

(b)  10-12 m

(b)  10-15m

4.  one second Equivalent to

(a)   1650763.73 oscillations of the krypton clock

(b)   652189.63 oscillations of the krypton clock

(c)  1650763.73 oscillations of the cesium clock

(d)  919,26,31,770 oscillations of GY cesium clock is:

5. Light year unit of

(a)  Distance

(b)  velocity

(c)  time

(d)  momentum

6. What is the wavelength of orange light in krypton-86 at 1 m of momentum:

(a)  1553164.13

(b)  1650763.73

(c)  2348123.75

(d)   652189.63

7.  1 tow is equivalent to:

(a)  1 atmosphere

(b)  1 mm mercury

(c)  1 cm mercury

(d)  1 meter mercury

8.Which of the following is not expressed in appropriate(proper) units:(a)stress/deformation = newton/meter2

(b) surface tension = newton / meter

(c) energy = kg - meter / second
(d) Pressure = Newton / m2

9. The percentage error in measurement of radius of a sphere is 0.3What will be the percentage error in the measurement of the volume of the sphere?

(a)  0.3%

(b)  0.6%

(c 0.9%
(d) ¾π×(0.3)3

## 1.The linear formula for the coefficient of volume elasticity is -

(a)  [ML-2T-2]
(b)  [ML-3T-2]

(d)  [ML-1T-2]

2. The dimensional formula of moment of force is

(a)  [ML2T - 2]

(b)  [MLT-2]

(c)  [MLT-1]

(d)  [MT 2]

3.Dimensional formula of latent heat

(a)  [MLT2]

(b)  [ML2T - 1]

(d)  [ML2T-2]

4. The dimension of universal gravitational constant is

(a)  [M -2 L2T-3]
(b)  [MLT - 2]

(b)  [M - 1L3T - 1]

(d)  [M -1 L3T -2 ]

5.If C and R respectively represent capacitance and resistance, then the dimensions of CR are

(a)  [M0L0 T - 1]

(b)  [M0 L0T2]

(c)  [M0 L0T]

(d)  [M2L0T2]

6.If L and R exhibit inductance and resistance respectively, then the L/R dimensions are

(a)  [M0L0T0]
(b)  [M0L0T]

(b)  [M2L0T2]

(d)  [MLT-2]

7. If C L denote permeability and inductance respectively, then LC will be the dimension

(a)  [M0L0T0]

(b)  [M0L0T - 2]

(d)  [M 0L 0 T0]

8. Which of the following pairs have the same dimensions as physical

(a)  Work and power

(b)  Work and moment of force

(c)  moment of force  and  moment of inertia

(d)  moment of force  and  angular momentum

9. Which of the following groups does not have the same amount of physical quantities as pair.

(a) modulus of elasticity,pressure,stress

(b) Work, heat and energy

(c) Electric carrying force, potential difference and voltage

(d) Electrical flux , electric field and electrical power supply