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abrowaqas
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Homework Statement
Somebody please check my multiple choice questions, I have attempted in my exam.
The capital letter is the answer that I have ticked in the exam.
Homework Equations
The Attempt at a Solution
1. The angular momentum of a particle under the influence of a central force is
a) Infinite b) Negative c) ZERO d) Constant
reason: bcoz angular momentum is always act externally.
2. Transverse component of the central force acting on a particle to keep it moving along a path is
a) Mv2r b)mv2/r c) ZERO d) constant
reason: bcoz there is no transverse component of velocity
3. Law of Intertia can be defined in
a) Accelerated system b) NON ACCELERATED SYSTEM c) both a) & b) d)None of these
reason: Newtons laws are only valid in non accelerated system
4. The K.E of the particle executing a uniform circular motion:
a) Increases b) decreases c) REMAINS SAME d)None of these
reason: k.E = .5 mv2. since m is const and v is also uniform hence no change in k.E
5. What type of force acts on a raindrop to reduce its speed?
a) Gravitational force b) FORCE OF FRICTION c) Electromagnetic force d) drag force
6. The branch of heat relating to the measurement of temperature of body is called
a) THERMOMETRY b) photometry c) ellipsometry d) calorimetry
7. Which type of ideal gas will have the largest value for Cp-Cv
a) MONOATOMIC b) diatomic c) polyatomic d) the value is same for all
reason: it was an educated guess.
8. What would be the most likely value for Ct, the molar heat capacity at constant temperature
a) Zero b) zero<Ct< Cv c) CV<CT<CP d) Ct= infinite
reason: here answer is C. it was a guess.
9. For which of the following process the entropy changes zero?
a) Isobaric b) isothermal c) ADIABATIC d) isochoric
reason: since no heat loss and gain in adiabatic so entropy changes zero. coz entropy = Q/T
10. The zeroth law of thermodynamics helps to define the term
a) TEMPERATURE b) pressure c) volume d) density
11. The law of conservation of mass in fluid dynamics can be expressed as
a) Av= constant b) RHO AV= CONSTANT c) P+(1/2)rho V + rho gy = constant d)None of these
reason: law of continuity of fluids flow.
12. The SI Unit of Viscosity is
a) N-S/M2 b) Dynes-s/cm2 c) N-s/m dynes-s/cm
reason: the answer is a.
13. The equation of the continuity requires that the total mass within certain volume must remain constant:
a) If there are sources as well as sinks
B) IF THERE ARE NO SOURCES & SINKS
c) If there are sources only
d) If there are sinks only
reason: its a guess.
14. If the length of the “L” and the total force acting on it is “F” then surface tension given is
a) F*L b)F.L C) F/L d) L/F
reason: the answer is C.
15. If the particle of liquid which pass through a certain point do not follow the same path, as that followed by the particles that passed the same point previously the liquid is said to have
a) STEADY b) Non steady flow c) turbulent flow d)None of these
16. The potential energy of a simple harmonic oscillator is
a) –Kx b) –Kx2 c) 0.5 Kx2 D) -.5KX2
reason: The answer is d. bcoz the direction of SHO is always pointing towards origin
17. Types of the mechanical weaves are
a) Longitudinal and transverse waves
B) SOUND AND RADIO WAVES
c) Longitudinal and transverse waves
d) Transverse & x-rays
18. The refracted ray bends towards the normal when it enters from
A) RARE TO DENSER MEDIUM
b) denser to rare medium
c) Air to vacuum
d) None of these
19. On a reflection from a fixed end, a transverse wave undergoes a phase change of___ degrees
a) 90 b) 180 c) 270 d) 360
reason: the answer is 180. then sin function changes every 180 of phase difference
20. Resolving power of a gratting can be written as:
a) LAMBA/DEL LAMDA b) del theta/del lamda c) del lamda/lamda d) del lamda/del theta
reason: the answer is a.