Related Questions

The membership of two committees , football committee and cricket committee , must be drawn exclusively form a group of seven people . Farid, Gaffar , Helal , Iftekhar , Jalil , Kalam and Lalit. * Each of the seven people must serve on a committee. * No one can serve on both committees. * Farid cannot be on a committee with Gaffar or with Jalil. * Helal cannot serve on a committee with Iftekhar. If Helal serves on football committee, which of the following must be true?
A Farid serves on football committee
B Gaffar serves on cricket committee
C Iftekhar serves on cricket committee
D Kalam serves on football committee
The materials which become polarized on the application of mechanical stress are called piezoelectric.
A True
B False
Piezoelectric quartz crystal resonators find application where
A Signal amplification is required
B Rectification of the signal is required
C Signal frequency control is required
D Modulation of signal is required
The piezoelectric effect in a crystal is ___________
A A voltage developed because of mechanical stress
B A change in resistance because of temperature
C A change in frequency because of temperature
D None of the above
Piezoelectric is a material
A Whose properties is midway between the constituent materials
B Which gets polarised, when stressed
C In which magnetising force reduces when current flowing through it is in-cresed
D Which changes dimensions due to applied field
Geothermal energy may serve as an important source of energy in
A The Konkan Coast
B Ladakh District
C Aravalli Hills
D Narmada Valley
Canals serve as passage of communication in the city of ________ in Italy.
A Rome
B Venice
C Turin
D Genoa
Thermoplastic materials are those materials which
A Do not become hard with the application of heat and pressure and no chemical change occurs
B Are flexible and can withstand considerable wear under suitable conditions
C Are formed into shape under heat and pressure and results in a permanently hard product
D Are used as a friction lining for clutches and brakes
In drilling softer materials, the cutting speed is ___________ as compared to harder materials.
A Same
B Low
C High
D None of these
Certain type of materials generates an electrostatic charge or voltage when mechanical force is applied across them. Such materials are called
A Piezo-electric
B Photo-electric
C Thermo-electric
D Photo-resistive

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