Quartz crystal in quartz watches work on the principle called?

A. Photoelectric effect
B. Stark effect
C. Thermionic effect
D. Piezo-electric effect

Animal which captures and readily kills living animals for its food is called___________?

A. Parasite
B. Scavenger
C. Predator
D. Mammal

In a railway track, two rails are joined end to end with a gap tin between them because?

A. Steel can be saved
B. Accidents due to contraction in winter can be avoided
C. Air gaps are necessary for bearing the weight of running train
D. Accidents due to expansion in summer can be avoided

Name the famous book of Ibn-Sina in which he discussed human physiology and medicine ?

A. Al-qanun
B. Al-masudi
C. New renaissance
D. Tadhkira

In winter an iron pipe feel colder than a wooden window . This is because wood is_______?

A. Conductor
B. Non-conductor
C. Semi- conductor
D. Not a solid while iron is a solid

The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ________?

A. 1120 ft
B. 120 ft
C. 56 ft
D. 100 ft

It is possible to recognize a person in the dark by simply hearing his unique voice . It is because of the_______?

A. Pitch
B. Frequency
C. Time period
D. Quality

A six feet tall lady wants to see her full image in a plane mirror . The minimum length of the mirror will be ?

A. 6 feet
B. 12 feet
C. 4 feet
D. 3 feet

The principle used in radar is the same as that of Sonar. In radar we use radio waves ; whereas in sonar we use ?

A. Red waves
B. Infrared waves
C. Ultrasonic
D. Super sonic

Parsec is a unit of ___________?

A. Energy
B. Time
C. Power
D. Distance