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11th Physics Weekly Test -3 ( Nature of Physical World and Measurement)

MABS Institution

11th Physics Weekly Test -3 ( Nature of Physical World and Measurement)-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

A source having luminous intensity of one candela emits monochromatic radiation of frequency:

5.4X10¹⁴Hz
54x10¹⁴Hz
4.5x10¹⁴Hz
\({1\over683}Hz\)

The shift in the position of an object when viewed with two eyes, keeping one eye closed at a time is known as___________.

basis
fundamental
parallax
pendulum

If speed of light (c), acceleration due to gravity (g) and pressure (P) are taken as fundamental units, the possible relation to gravitational constant (G) is ___________________

c^o g p^-3
c² g³ p^-2
c ^o g³ p^-1
c ² g² p^-2

What is the value of one light year in tera metre?

9.46 x 10⁶Tm
9.46 x 10⁹Tm
9.46 x 10²Tm
9.46 x 10³Tm

The Van der Waal equation for n moles of a real gas is \((P+\frac{a}{V^2})(V-b)=RT\) where P is the pressure. V is the volume. T is the absolute temperature. R is the molar gas constant and 'a' and 'b' are Van der Waal constants. The dimensions of 'a' are the same as those of

\(\frac{P}{V}\)
PV
PV2
P2V

Which one of the following is used to determine very large distance?

Radar method
Parallax method
Triangulation method
all the above

Dimensions of impulse are _______________

[ML²T^-1]
[MLT^-2]
[MLT^-1]
[ML²T⁰]

The mass of an iron sheet is 0.250 kg and volume of the sheet is 1.5m³ Then what is the density of the iron sheet? Express the result in SI unit system.

0.267kg m^-3
0.167 kg m^-3
0.255 kg m^-3
0.285 kg m^-3

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:

4%
6%
2%
9%

The force F is given by F = at + bt² where t is time. The dimensions of 'a' and 'b' respectively are

[M LT^-3] and [MLT^-4]
[M LT^-4] and [MLT^-3]
[M LT^-1] and [MLT^-2]
[M LT^-2] and [MLT^-0]

Equivalent of one joule is____________

Nm²
kg m² s^-2
kg m s^-1
N kg m²

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

8%
4%
6%
3%

The product of Avogadro constant and elementary charge is known as __________constant.

Planck's
Avagadro
Boltzmann
Faraday

3.5 kg mass of a metal plate has the volume of 1.5 m³. Find the density of metal plate.

1.5 kg/m³
2.3 kg/m³
3.4 kg/m³
4.8 kg/m³

The velocity of a particle v at an instant t is given by v = at + bt². The dimensions of b is

[L]
[LT^-1]
[LT^-2]
[LT^-3]

The sum of the numbers 436.32, 227.2 and 0.301 in appropriate significant figure is:

663.82
663.8
664
6663.82

The study of production and propagation of sound waves________

Astrophysics
Acoustics
Relativity
Atomic physics

Ihe density of a cube is measured by measuring its mass and length of its side. If the maximum error in the measurement of mass and length are 3% and 2% respectively, the maximum error in the measurement of density is

1%
9%
7%
5%

\(\frac { 1 }{ 12 } \) of the mass of carbon 12 atom is______

1 TMC
mass of neutron
1 amu
mass of hydrogen

The speed of gravity waves in water is proportional to \(\lambda^a\rho^bg^y\)where \(\lambda\) is the wavelength, p isthe density of water and g is the acceleration due to gravity. The correct relation between \(\alpha,\beta\) and r is

\(\alpha\ne\beta\ne\gamma\)
\(\alpha\ne\gamma=\beta\)
\(\alpha=\gamma\ne\beta\)
\(\alpha=\beta=\gamma\)

1 CSL is the largest practical unit of:

time
mass
temperature
intensity of radiation

The value of 1° is,

1.745 x 10^-2 rad
1.946 x 10^-11 rad
3.6 rad
3600 rad

Which of the following pairs of physical quantities have same dimension?

force and power
torque and energy
torque and power
force and torque

Random error can also be called as__________.

personal error
chance error
gross error
system error

If the force is proportional to square of velocity, then the dimension of proportionality constant is

[MLT⁰]
[MLT^-1]
[MLT^-2T]
[MLT^-1T⁰]

The angle of an object is 18.2°. What is the angular diameter of the object in radians?

36.4 rad
3.64 x 10^-2 rad
31.74 x 10^-2rad
3.17 rad

1 second of arc is equal to______

0.00027^o
1.745\(\times\)10^-2rad
2.91\(\times\)10^-4rad
4.85\(\times\)10^-6rad

One atomus equal to ________

100 ms
\(\frac { 1 }{ 6.25 } \) ms
160 ms
160 ms

How many light years make 1 parsec?

3.26
6.67
1.5
9.4

Least count of metre scale:

1 cm
0.1 cm
1mm
0.1 mm

Femto is equal to:

10^-6m
10-¹³m
10^-15m
10^-12m

Zero error of an instrument is a______________.

Systematic error
Random error
Gross error
Both (a) and (b)

Which of the following is having same dimensional formula?

Work and power
Radius of gyration and displacement
Impulse and force
Frequencies and wavelength

Number of significant digit in 20.00______.

1
2
3
4

If dimensions of critical velocity V_c of a liquid flowing through a tube are expressed as [\(\eta^x\rho^y\gamma^z\)]where \(\eta\), \(\rho\) and \(\gamma\) are the coefficient of viscosity of liquid, density or: liquid and radius of the tube respectively, then the values of x, y and z are given by

-1,-1,-1
1,1,1
1,-1,-1
-1,-1,1

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