1. Atoms of an element differ from those of all other elements in
a) Atomic number and electronic configuration
b) Number of neutrons and number of valence electrons
c) Atomic number and number of valence electrons.
d) Number of neutrons and electronic configuration.
Explanation: Atoms of an element differ from those of all other elements in number of neutrons and electronic configuration.
2. Nuclear fission is caused by the impact of:
Explanation: Nuclear fission in fissile fuels is the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
3. Which of the following rays are the most penetrating?
a) Beta rays
b) Alpha rays
c) Gamma rays
Explanation: Gamma radiation is the most penetrating of the three radiations. It can easily penetrate body tissue
4. How many colours the sunlight spectrum has?
Explanation: We can observe on the paper that the sunlight is split into a spectrum of colours like a rainbow, every colour in VIBGYOR pattern i.e., violet, indigo, blue, green, yellow, orange and red can be seen. The conclusion drawn here is that sunlight is nothing but a mixture of seven colours.
5.Which is/are the important raw material(s) required in cement industry?
a) Gypsum and Clay
c) Limestone and Clay
Explanation: The important raw material(s) required in cement industry Limestone and Clay.
6. Light year is a measurement of
a) Speed of aeroplanes
b) Speed of light
c) Stellar distances
d) Speed of rockets
Explanation: Light year is a measurement of Stellar distances
7. very small time intervals are accurately measured by
a) White dwarfs
b) Quartz clocks
c) Atomic clocks
Explanation: Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS
8. One kilometer is equal to how many miles?
Explanation: One kilometer is equal to 0.62 mile.
9. Kilohertz is a unit which measures
a) Power used by a current of one ampere
b) Electromagnetic radio wave frequencies
d) Electric resistance
Explanation: Kilohertz is a unit which measures electromagnetic radio wave frequencies.
10. One horse power is equal to
a) 746 watts
b) 748 watts
c) 756 watts
d) 736 watts
Explanation: Electrical equivalent of one horsepower is 746 watts in the International System of Units (SI), and the heat equivalent is 2,545 BTU (British Thermal Units) per hour.