1). Which is most efficient engine?
 Ans: Electric
2). Between which bodies is one Astronomical Unit the average distance?
Ans: Earth and the Sun
3). In our houses we get 220 V A. C What does the value 220 represent?
Ans: Effective voltage
4). What does the rise of mercury in a barometer indicate?
Ans: Fair weather
5). What is the energy of the winds and the waves?
 Ans: Kinetic
6). If the temperature of a semiconductor rises, what is its resistivity?
 Ans: Decrease
7). How does Transfer of heat energy from the sun to the moon take place?
Ans: By radiation only
8). A fan produces a feeling of comfort during hot weather. Why?
Ans: Our perspiration evaporates rapidly
9). Why are Clear nights cooler than cloudy nights?
Ans: Because of radiation
10). In which transmission are sound and video signals transmitted simultaneously?
Ans: T.V. Transmission
11). What is the best conductor of electricity?
 Ans : Salt water
12). Which is used as a coolant in nuclear reactors?
Ans: Liquid sodium
13). Optic fibers are mainly used for which purpose?
Ans: Communication
14). Mesons are found in which rays?
Ans: Cosmic rays
15). Old-written material, which cannot be read easily, how can be read?
Ans: By infrared rays
16). In an atomic nucleus, by which force are neutrons and protons held together?
Ans: Exchange forces
17). Which purified oil does Aviation fuel for jet aero planes consist?
Ans: Kerosene
18). Who received Nobel Prize twice for the same subject?
Ans: Marie Curie
19). What does Every object at a temperature above absolute zero?
Ans: Radiates energy
20). By whom was Electron first identified?
Ans: J. J. Thomson
21). Which is the unit of activity of a radioactive source?
Ans: Becquerel
22). In a sitar wire which type of vibration is produced?
Ans: Stationary transverse
23). Which common devices works on the basis of the principle of mutual induction?
Ans: Transformer
24). Through which material does sound travel slowest?
Ans: Wood
25). Which is printed on a commonly used fluorescent tube light?
Ans: 6500 k
26). To an astronaut, how does outer space appear?
Ans: Black
27). When iron rusts, how is its weight?
Ans: Increases
28). Which is the color of the outer edge of the rainbow?
Ans: Red
29). Of which iron is Core of transformer made up?
Ans: Soft iron
30). Whose experiments proved that the speed of light was always the same?
Ans: Michelson and Morley
31). The wavelength of X-rays is of the order of how many angstrom?
Ans: 1 Angstrom
32). Which of the following is used as ‘a moderator in nuclear reactor?
Ans: Graphite
33). Which of the following is good nuclear fuel?
Ans: Plutonium-239
34). What is the wavelength of visible spectrum?
Ans: 3900-7600 A
35). In which technology do Cryogenic engines find applications?
 Ans: Rocket technology
36). In a refrigerator, by which is cooling is produced?
Ans: By the evaporation of a volatile liquid
37). Which polymer is widely used for making bullet proof material?
Ans: Polyethylene
38). Who is the recipient of Nobel Prize for the development of Wireless Telegraphy?
Ans: Marconi
39). Who laid the foundation of nuclear science in the country?
Ans: Homi J. Bhabha
40). What happens to the level of mercury in the barometer tube when it is taken down a coal mine?
Ans: It rises
41). How must be the The lines of force of a uniform magnetic field?
Ans: Parallel to each other
42). Which would expand the most on being heated?
Ans: Air
43). What will be best colours for a Sun umbrella?
Ans: White on top and black on inside
44). What do we use in SONAR?
Ans: Ultrasonic waves
45). A body has a mass of 6 kg on the Earth; when measured on the Moon, what would be its mas?
Ans: 6 kg
46). At the time of short-circuit, what will be the current in the circuit?
Ans: Increases heavily
47). How can one can distinguish a telescope from a microscope?
Ans: By observing size of the lens
48). Which sound-produced by a bat?
Ans: Ultrasonic
49). How is the frequency of ultrasound wave typically?
Ans: Above 20,000 kHz
50). By which impact is Nuclear fission is caused ?
Ans: Neutron
51). Which law is involved in the act of cleaning a carpet by beating it with a stick?
Ans: First law of motion
52). Which remains constant while throwing a ball upward?
Ans: Acceleration
53). DC current can be controlled by which component?
Ans: Resistance
54). Which radiation carries maximum energy?
Ans: Gamma-rays
55). Which is a good conductor of electricity?
Ans: Human body
56). On which conservation law, does a rocker work?
Ans: Angular momentum
57). What denotes the smallest temperature?
Ans: 1° on the Kelvin scale
58). What is the function of heavy water in a nuclear reactor?
Ans: Slow down the speed of neutrons
59). Which has the least penetrating power?
Ans: Alpha particles
60). Which rays are most penetrating?
Ans: y-rays
61). The hydraulic brakes used in automobiles is a direct application of which law?
Ans: Pascal’s law
62). One horse power is equal to how many watts?
Ans: 746 watts
63). What is the number of basic units in the International System of Units?
Ans: 7
64). If you swim one km, how many miles do you swim?
Ans: 0.62
65). The pH of water at 25°C is 7. When it is heated to 100°C, then what will be the pH of water?
Ans: Remains same
66). How can the quantity of water vapor the atmosphere hold increases?
Ans: With increase of temperature
67). When milk is churned, how does the cream separate from it?
Ans: Due to the centrifugal force
68). We cannot see during a fog. why?
Ans: Because of scattering of light
69). In storms, the roofs of some houses are carried away. According whom is this?
Ans: Bernoulli’s principle
70). Why is phenomenon of mirage?
Ans: Due to total internal reflection
71). When the greatest pressure exerted on the ground by a man?
Ans: When he stands on the toes of one foot
72). ‘Hydraulic brakes’ and ‘Hydraulic lift’ are devices, why are fluids used in them?
Ans: For transmitting pressure
73). In an atomic explosion, enormous energy is released why?
Ans: Due to the conversion of mass into energy
74). Why is a moderator used in nuclear reactors?
Ans: In order to slow down the speed of neutrons
75). What will be the best colour (s) for a sun umbrella?
Ans: White on top and black on the inside
76). How should a man wearing spectacles work with a microscope?
Ans: He should keep on wearing spectacles
77). What does the emission of ß-particle?
Ans: Increases the atomic number by one
78). On which does Kinetic Energy depend?
Ans: Both mass and velocity of the moving body
79). Which are the discovery of Einstein?
 Ans: Theory of relativity and photoelectric effect
80). When does Super conductivity result?
Ans: When matter is cooled to very low temperature
81). What does a permanent magnet repel?
Ans: Diamagnetic substances only
82). A convex mirror makes a good rear-view mirror for a car. Why?
Ans: It forms erect, reduced images
83). A convex mirror makes a good rear-view mirror for a car. Why?
Ans: It forms erect, reduced images
84). What is the approximate velocity of light per second?
Ans: 3 × 108 m
85). If one wants to throw a cricket ball to the maximum distance, then at which angle should he throw it?
Ans: 45°
86). How are Air-pockets that cause aircraft to lose altitude suddenly caused?
Ans: Temperature inversions
87). Which pairs of rays is electromagnetic in nature?
Ans: x-rays and gamma rays
88). Speed of sound is greater in solids than in liquids?
Ans: Because the solids have high elasticity
89). Why does a bubble of water shines?
Ans: Because of total internal reflection
90). With which instrument can a sailor in a submarine see the objects on the surface of sea?
Ans: Periscope
91). On which principle does Rocket work?
 Ans: Conservation of momentum
92). The mass-energy relation is the outcome of which theory?
Ans: Special theory of relativity
93). Recoil of a gun is an example of which thing?
Ans: Conservation of linear momentum
94). By whom was Neutron discovered?
Ans: Chadwick
95). Which are the best and the poorest conductors of heat respectively?
Ans: Silver (Ag), and lead (Pb)
96). When light passes from air into glass it experiences change in which things?
Ans: Wavelength and speed
97). The working of optical is based on which of electromagnetic waves?
Ans: Total internal reflection
98). Soap is used in washing. Why?
Ans: It lowers the surface tension of water
99). Sound travels faster in which thing?
Ans: Iron than in air
100). Why is the term ‘hydroponics’ used?
 Ans: To describe cultivation of plants in water
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