1). Which is most efficient engine?
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?
6). If the temperature of a semiconductor rises, what is its resistivity?
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?
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?
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?
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?
24). Through which material does sound travel slowest?
25). Which is printed on a commonly used fluorescent tube light?
Ans: 6500 k
26). To an astronaut, how does outer space appear?
27). When iron rusts, how is its weight?
28). Which is the color of the outer edge of the rainbow?
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?
33). Which of the following is good nuclear fuel?
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?
38). Who is the recipient of Nobel Prize for the development of Wireless Telegraphy?
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?
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?
49). How is the frequency of ultrasound wave typically?
Ans: Above 20,000 kHz
50). By which impact is Nuclear fission is caused ?
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?
53). DC current can be controlled by which component?
54). Which radiation carries maximum energy?
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?
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?
64). If you swim one km, how many miles do you swim?
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?
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?
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?
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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