231. The element used in lead pencils is_____?
A: Lead
B: Zinc
C: Carbon
D: Tin
232. A glass chimney stops an oil lamp from smoking because:
A: The heat produced ensures complete
B: It increases the supply of oxygen to the flame by convection
C: Both of these
D: Neither of these
233. The Scientist who told “Heat is a form of Energy” was______?
A: Newton
B: Thomas Alva Edison
C: Joule
D: Kepler
234. Information can be sent over a long distance in the form of:
A. Electrical signals through wires
B. Light signal through optical fiber
C. Radio waves through air
D. Any combination of these three
235. Information can be stored in:
A. Audio and video cassettes
B. Floppy and compact discs
C. Hard disks
D. Laser and optical disks
E. All of these four
236. Computers can:
A. Add and subtract information only
B. Add, subtract and sort information only
C. Add, subtract, sort and classify information
D. Add, subtract but cannot sort information
E. Add, Subtract and sort but cannot classify the data
237. IBM Stands for:
A. International Business Machines
B. International Big Machines
C. International Business Machines
D. Interrelated Big Machines
E. None of them
238. Chemicals used to kill weeds are called as:
A. Insecticides
B. Fungicides
C. Herbicides
D. Fumigants
E. None of these
239. The cytoplasm consists of several types of structures, which are called:
A. Protoplasm
B. Nucleus
C. Organelles
D. Cytochromes
E. None of these
240. The structure of DNA was elaborated by Watson and Crick in:
A. 1909
B. 1923
C. 1945
D. 1953
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