Multiple Choice QuestionsWhich one of the following devices changes low voltage alternating current to high voltage alternating current and vice-versa?
Generator
Motor
Transformer
Vibrator
An optical illusion which occurs mainly in deserts during hot summer is based on the principle of
Reflection
Interference
Dispersion
Total internal reflection
D.
Total internal reflection
When any light ray enters from optically denser medium to optically rarer medium then due to refraction, light ray bends away from the normal. But as well as the values of angles of incidence are increased, the light bending away from the normal becomes more and more away. Thus value of angle of refraction is in increasing order.
At which place Earth's magnetic field becomes horizontal?
Magnetic meridian
Magnetic equator
Geographical pole
Tropic of Cancer
The speed of a car travelling on a straight road is listed below at successive intervals of 1s:
0 1 2 3 4 Time (s)
0 2 4 6 8 Speed (m/s)
Which of the following is/are correct?
The car travels
1. with a uniform acceleration of 2 m/s2
2. 16m in 4s
3. with an average speed of 4 m/s.
Select the correct answer using the code given below:
1, 2 and 3
2 and 3 only
1 and 2 only
1 only
Molecules of which of the following has cage like structure?
1. Diamond
2. Graphite
3. Fullerenes
Select the correct answer using the code given below:
1, 2 and 3
2 and 3 only
2 only
3 only
Temporary hardness in water is due to which one of the following of Calcium and Magnesium?
Hydrogen carbonates
Carbonates
Chlorides
Sulphates
Stung by hairs of nettle leaves causes burning pain. This is due to the injection of
Acetic acid
Methanoic acid
Sulphuric acid
Hydrochloric acid
Which one of the following elements is least reactive with water?
Lithium
Sodium
Potassium
Cesium
Rutherford's alpha-particle scattering experiment was responsible for the discovery of
Electron
Proton
Nucleus
Helium
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