Join Us ::

Menu Home Classes GK Engineering Past Papers Current Affairs Technical GAT Subject Programming Medical Papers

Engineering :: All Aptitude Test ::

Home » Engineering » Aptitude Test - 83
Hassan
1.The process of heat transfer from one particle of the body to another without actual motion of the particle is called
A. Radiation
B. Conduction
C. Convection
D. Radiation
2.Fourier law of heat conduction is based on the assumption that
A. Heat flow through a solid is one dimensional
B. Heat flow is in steady state
C. Both (A) and (B)
D. Heat flow through a solid is one dimensional
3.Unit of thermal conductivity in M.K.S. units is
A. kcal/kg m2 °C
B. kcal-m/hr m2 °C
C. kcal/hr m2 °C
D. kcal/kg m2 °C
4.Thermal conductivity of solid metals with rise in temperature normally
A. Increases
B. Decreases
C. Remains Constant
D. Increases
5.When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by
A. Conduction
B. Convection
C. Radiation
D. Conduction
6.When heat is Transferred by molecular collision, it is referred to as heat transfer by
A. Conduction
B. Convection
C. Radiation
D. Conduction
7. Pick up the wrong case. Heat flowing from one side to other depends directly on
A. Face Area
B. Time
C. Thickness
D. Face Area
8.Cork is a good insulator because it has
A. Free Electrons
B. Atoms Colliding Frequency
C. Low Density
D. Free Electrons
9.Thermal conductivity of water at 20°C is of the order of
A. 0.1
B. 0.23
C. 0.42
D. 0.1
10.A dimensionless heat transfer coefficient which gives a measure of the ratio of the heat transfer rate to the rate at which heat would be conducted within the fluid under a temperature gradient is kno
A. Reynolds number
B. Grashoff number
C. Nusselt number
D. Reynolds number
11.A dimensionless number which is the ratio of mass heat flow rate to the heat flow rate by conduction under a unit temperature gradient and through a thickness L is known as
A. Peclet number
B. Nusselt number
C. Grashof number
D. Peclet number
12.A non-dimensional number generally associated with natural convection heat transfer is
A. Peclet number
B. Nusselt number
C. Prandtl number
D. Peclet number
13.A dimensionless number representing the ratio of inertia forces to viscous forces is known as
A. Reynolds number
B. Prandtl number
C. Nusselt number
D. Reynolds number
14.A dimensionless group which represents the rate of the (product of intertial forces times buoyant forces) to viscous force squared is known as
A. Reynolds number
B. Prandtl number
C. Nusselt number
D. Reynolds number
15.Dynamic similarity is the similarity of
A. Shape
B. Forces
C. Velocities
D. Shape
16.A dimensionless number which is the ratio of kinematic viscosity to thermal diffusivity is known as
A. Prandtl number
B. Reynolds number
C. Nusselt number
D. Prandtl number
17.A non-dimensional number which generally finds application in mass transfer problems is
A. Stanton number
B. Stanton number
C. Graetz number
D. Stanton number
18.Longest wavelength
A. Gamma rays
B. X-rays
C. Ultraviolet rays
D. Gamma rays
19.The wagelength of X-rays is
A. 6 to 100000 micron
B. 0.4 to 0.8 micron
C. 0.1 to 0.4 micron
D. 6 to 100000 micron
20.a micron is equal to
A. 10-4 metres
B. 10-5 metres
C. 10-6 metres
D. 10-4 metres
21.If the absorptivity plus reflectivity of a body equals 1, then the body is known as
A. Black body
B. Grey body
C. Opaque body
D. Black body
22. Gases have poor
A. Reflectivity
B. Absorptivity
C. Transmissivity
D. Reflectivity
23.All substances emit radiation, the quality and quantity depending upon the absolute temperature and the properties of the material composing the radiating body. The above statement is known as the sta
A. Planck's law
B. Kirchhoff's law
C. Stefan-Bolzmann's law
D. Planck's law
24. The relation between the emissive and absorptive power of a surface is developed under
A. Planck's law
B. Kirchhoff's law
C. Electrical analogy
D. Planck's law
25. For all substances the absorptivity must lie between
A. 0 and 0.1
B. ?1 and +1
C. ?0.5 and + 0.5
D. 0 and 0.1
26. Which one of the following approximates to the black body condition?
A. Ice
B. Water
C. Lamp black
D. Ice
27.Which one of the following will radiate heat to a large extent?
A. White polished surface
B. White rough surface
C. Black rough surface
D. White polished surface
28. Two bodies one hot and the other cold are kept in vacuum. What will happen to the temperature of the hot body after sometime?
A. Remains the same
B. Decreases due to convection
C. Increases due to convection
D. Remains the same
29. A body cools from 90?C to 80?C in 5 minutes. Under the same external conditions to cool from 80?C to 70?C the body will take
A. 5 minutes
B. 4 minutes
C. 2.5 minutes
D. 5 minutes
30.The surface temperature of the sun is
A. 2000?K
B. 6000?K
C. 20000?K
D. 2000?K
Related Subjects

Date to Date Current Affairs 2022

PakMCQs.net

Quick Links

GAT Subject



   Computer Science    English Mcqs    Agriculture    

Engineering



   Computer Science    Civil Engineering    

Technical



   Networking    Electronics    Database    

Past Papers



   Model Papers    FPSC Papers    
Our Team | Career | Contact | JoinUs | Privacy Policy | DMC

© 2020-2024 by Pak-MCQs.net All Rights Reserved.

Email: [email protected]