NEET Foundation Material for Class-VIII ,NEET Botany,Chemistry,Physics

# NEET Physics units and measurements Test-6

NEET Physics units and measurements Test-6

1. Which of the following is not a unit of time
a) par – sec
b) light – year
c) micron
d) sec

2. Which of the following is dimensionless
a) Boltzmann constant
b) Planks constant
c) Poissons ratio
d) Relative density

3. For a body in a uniformly accelerated motion, the distance of the body from a reference point at time ‘t’ is given by x=at+ bt2 + c where a, b, c are constants. The dimensions of V are the same as those of
a) x
b)at
c)bt2
d) a2/b

4. If e, E0, h and C respectively represents electronic change, permittivity of free space, planks constant and speed of light then $latex frac { { e }^{ 2 } }{ { E }_{ 0 }hC }$ has the dimensions of
a) angle
b) relative density
c) strain
d) current

5. Photon is quantum of radiation with energy E = hv where v is frequency and h is Planck’s constant. The dimensions of h are the same as that of
a) Linear impulse
b) Angular impulse
c) Linear momentum
d) Angular momentum

6. If planck’ s constant (h) and speed of light in vacuum (c) are taken as two fundamental quantities, which one of the following can, in addition, be taken to express length, mass and time in terms of the three chosen fundamental quantities?
a) Mass of electron (me)
b) Universal gravitational constant (G)
c) Charage of electron (e)
d) Mass of proton(mp )

7. A book with many printing errors contains four different expressions for the displacement ‘y’ of a particle executing simple harmonic motion. The wrong formula on dimensional basis (v = velocity)
i) y = A sin(2π t / T)
ii) y = A sin(Vt)
iii) y = A / Tsin(t /A)
iv) y =$latex frac { A }{ sqrt { 2 } }$ (sin ω t + cos ω t)

8. List-1

a) Temperature
b) Mass
c) Length
d) Time
List – 2

e) Light Year
f) Shake
g) Fahrenheit
h) Atomi Mass unit

9. List-1

a) Second
b) Mole
c) Metre
d) Kilogram
List – 2

e) Carbon – 12
f) Platinum iridium
g) Cs – 133
h) Kr – 86

10. List-1

a) m-1
b)Pa
c) JK-1
d) J m-2
List – 2

e) Surface tension
f) Thermal capacity
g) Rydberg constant
h) Energy density

11. List-1

a) Electron volt
b) kWH
c) Horse power
d) Fermi
List – 2

e) 746 W
f) 10-15 m
g) 36 x 105 J
h) 1.6x 10-19J

12. List -1
a) Pressure
b) Latent heat
d) Magnetic flux
List – 2

e) ML2 T-2 I-1
f) M0 L0 T-1
g) ML-1 T-2
h) M0 L2 T-2

13. List-1

a) Surface Tension
b) Specific heat
c) Latent heat
d) Kinematic viscosity
List – 2

e) Gas constant
f) Areal velocity
g) Spring constant
h) Gravitational potential

14. List-1

a) Same negative dimensions of mass
b) Same negative dimensions of length
c) Same dimensions of time
d) Same dimensions of current
List – 2

e) Pressure, Rydberg constant
f) Magnetic induction field, potential
g) Capacity, Universal gravitational constant
h) Energy density, Surface tension

15. Some physical constants are given in List- I and their dimensional formulae are given in List- Match the correct pairs in the lists

List -1
a) Planck’s constant
b) Gravitational constant
c) Bulk modulus
d) Coefficient of viscosity
List-2

e) ML, -1T2
f) ML-1T-1
g) ML2T-1
h) M-1L3T-2

16. Names of units of some physical quantities are given in List-1 and their dimensional formulae are given
in List- 2, Match correct pair in lists

List -1
a) pa s
b) NmK-1
c) Jkg-‘K-1
d) Wm-1K-1
List – 2

e) L2T-2K-1
f) MLT-3K-1
g) ML-1T-1
h) ML2TK-1

17. The density of mercury in cgs system is13.6 g cm Its value in SI is

18. A force of 40N acts on a body. If the units of mass and length are doubled and the unit of time is tripled, force in the new system becomes

19. If the unit of force were 10N, that of power were 1MW and that of time were 1 millisecond then the unit would be

20. If the unit of power is million erg/minute, the unit of force is 1000 dyne and the unit of length is 5/3 cm then the unit of time is (in second)

21. If the unit of length is doubled, unit of time is halved and unit of force is quadrupled, the unit of power would change by the factor

22. The volume V of a liquid crossing through a tube is related to the area of cross-section A, velocity v and times t as V ∝ Aavbtc which of the following is correct

23. The critical velocity v of a body depends on the coefficient of viscosity η the density d and radius of the drop r. If K is a dimensionless constant then v is equal to

24. If density (D), acceleration (a) and force (F) are taken as basic quantities, then Time period has dimensions

25. The critical angular velocity w of a cylinder inside another cylinder containing a liquid at which its turbulence occurs depends on viscosity eta, density d and the distance x between the walls of the cylinders. Then w is proportional to