GENERAL SCIENCE PHYSICS ONE LINERS FOR TNPSC UPSC SSC SET 034
331).
An equiconvex lens is prepared from a glass of refractive index 1.5.
The radius of curvature of the surface is 0.5 m. The focal length of the
lens is
A). 0.5 m
B). 1.0 m
C). 1.5 m
D). 2.0 m
Answer: 0.5 m
332). A light wave travelling in a transparent homogeneous medium enters another homogeneous transparent medium of higher refractive index. The speed of light in the second medium
A). is less than that in the first medium
B). is more than that in the first medium
C). is the same as that in the first medium
D). may be more or less than that in the first medium depending on the angle of incidence
Answer: is less than that in the first medium
333). For the stability of a floating body, the metacenter must be
A). on the surface of the floating body
B). above the centre of gravity of the floating body
C). below the centre of gravity of floating body
D). at the centre 0f gravity of the floating body
Answer: above the centre of gravity of the floating body
334). How many calories of heat will be required to convert 1 g of ice at 0∘C into steam at 100∘C ?
A). 720 cal
B). 640 cal
C). 540 cal
D). 180 cal
Answer: 720 cal
335). Xrays are used for the study of crystal structure because
A). away from the sun along a straight path with continuously increasing speed
B). the wavelength of X-rays is of the same order of magnitude is the interatomic spacing in crystals
C). the wavelength of X-rays is very small in comparison with the interatomic spacing in crystals
D). the crystals are completely transparent to X-rays
Answer: the wavelength of X-rays is of the same order of magnitude is the interatomic spacing in crystals
336). Consider the following statements Household electrical appliances are not usually connected in series, because
I. switching off an appliance would switch off the rest
II. a fuse would blow as soon as one appliance is used
III. power consumption would be very much greater
IV. the appliances would get damaged due to high current
Which of the following statements is/are correct?
A). I only
B). II and III
C). III and IV
D). I, II and IV
Answer: I, II and IV
337). In Bohr's Theory of the Atom, all the orbits of the electrons are considered circular in shape. The de Broglie wavelength λn corresponding to the electron in the nth orbit is
A). proportional to n
B). proportional to n^2
C). inversely proportional to n^2
D). inversely proportional to n
Answer: proportional to n
338). A planet revolves around the sun in an elliptical orbit. Suppose that the gravitational attraction between the sun and the planet suddenly disappears, the planet would move
A). towards the sun in a spiral path
B). away from the sun along a straight path with continuously increasing speed
C). with constant speed along a tangential path to the orbit
D). towards the sun along a straight path with constant speed
Answer: with constant speed along a tangential path to the orbit
339). The height of a building a 78.4 m. If a stone drops from the edge of the roof of the building, how much time does it take to reach the ground?
A). 8 seconds
B). 4 seconds
C). 12 seconds
D). 16 seconds
Answer: 4 seconds
340). A lens, immersed in a liquid, becomes invisible when ,
A). the focal length of the lens is zero
B). the focal length of the lens is infinite
C). the refractive index of the lens is less than t the refractive index of the liquid
D). the refractive index of the lens is equal to the refractive index of the liquid
Answer: the focal length of the lens is infinite
A). 0.5 m
B). 1.0 m
C). 1.5 m
D). 2.0 m
Answer: 0.5 m
332). A light wave travelling in a transparent homogeneous medium enters another homogeneous transparent medium of higher refractive index. The speed of light in the second medium
A). is less than that in the first medium
B). is more than that in the first medium
C). is the same as that in the first medium
D). may be more or less than that in the first medium depending on the angle of incidence
Answer: is less than that in the first medium
333). For the stability of a floating body, the metacenter must be
A). on the surface of the floating body
B). above the centre of gravity of the floating body
C). below the centre of gravity of floating body
D). at the centre 0f gravity of the floating body
Answer: above the centre of gravity of the floating body
334). How many calories of heat will be required to convert 1 g of ice at 0∘C into steam at 100∘C ?
A). 720 cal
B). 640 cal
C). 540 cal
D). 180 cal
Answer: 720 cal
335). Xrays are used for the study of crystal structure because
A). away from the sun along a straight path with continuously increasing speed
B). the wavelength of X-rays is of the same order of magnitude is the interatomic spacing in crystals
C). the wavelength of X-rays is very small in comparison with the interatomic spacing in crystals
D). the crystals are completely transparent to X-rays
Answer: the wavelength of X-rays is of the same order of magnitude is the interatomic spacing in crystals
336). Consider the following statements Household electrical appliances are not usually connected in series, because
I. switching off an appliance would switch off the rest
II. a fuse would blow as soon as one appliance is used
III. power consumption would be very much greater
IV. the appliances would get damaged due to high current
Which of the following statements is/are correct?
A). I only
B). II and III
C). III and IV
D). I, II and IV
Answer: I, II and IV
337). In Bohr's Theory of the Atom, all the orbits of the electrons are considered circular in shape. The de Broglie wavelength λn corresponding to the electron in the nth orbit is
A). proportional to n
B). proportional to n^2
C). inversely proportional to n^2
D). inversely proportional to n
Answer: proportional to n
338). A planet revolves around the sun in an elliptical orbit. Suppose that the gravitational attraction between the sun and the planet suddenly disappears, the planet would move
A). towards the sun in a spiral path
B). away from the sun along a straight path with continuously increasing speed
C). with constant speed along a tangential path to the orbit
D). towards the sun along a straight path with constant speed
Answer: with constant speed along a tangential path to the orbit
339). The height of a building a 78.4 m. If a stone drops from the edge of the roof of the building, how much time does it take to reach the ground?
A). 8 seconds
B). 4 seconds
C). 12 seconds
D). 16 seconds
Answer: 4 seconds
340). A lens, immersed in a liquid, becomes invisible when ,
A). the focal length of the lens is zero
B). the focal length of the lens is infinite
C). the refractive index of the lens is less than t the refractive index of the liquid
D). the refractive index of the lens is equal to the refractive index of the liquid
Answer: the focal length of the lens is infinite
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