1281. The development of the ultra microscope makes use of the :

A. Edison Effect
B. Tyndall Effect *
C. Brownian motion
D. Zeeman Effect

1282. Which of the following bases is involved in the making of soap?

A. Baking soda
B. Caustic soda *
C. Ammonia
D. Washing soda

1283. What is the PH of water ?

A. 9
B. 8
C. 7 *
D. 6

1284. Glass is made of :

A. Sand and Silicate
B. Quartz and Mica *
C. Sand and Silt
D. None of these

1285. Which of the following is most elastic ?

A. Wet Clay
B. Steel *
C. Plastic
D. Rubber

1286. Which of the following is called strategic metal ?

A. Silicon
B. Titanium
C. Uranium *
D. Germanium

1287. Which of the among the following is the main ingredient in cement?

A. Limestone
B. Gypsum *
C. Clay
D. Ash

1288. Which one among the following is not a source of renewable energy ?

A. Fuel cell *
B. Solar energy
C. Hydroelectricity
D. Wind energy

1289. For sending sound waves at large distance which waves are used :

A. Infrared waves
B. Radio waves *
C. Light waves
D. X-waves

1290. The waves used for sending signals to the satellite from ground station are :

A. X-Rays
B. Sound waves
C. Micro waves *
D. Ultraviolet Rays