Q. Let us consider a copper wire having radius r and length I. Let its resistance be R. If the radius of another copper wire is 2r and the length is 1/2 then the resistance of this wire will be -
1) R
2) 2R
3) R/ 4
4) R/ 8
Q. At 200C, the speed of sound in water is approximately -
1) 330 m/ s
2) 800 m/ s
3) 1500 m/ s
4) 5000 m/ s
Q. Which one of the following could be the melting point of iron?
1) 250C
2) 370C
3) 5000C
4) 15000C
Q. Who among the following has explained the phenomenon of photoelectric effect?
1) Max Planck
2) Albert Einstein
3) Neils Bohr
4) Ernest Rutherford
Q. Suppose there are two planets, 1 and 2, having the same density but their radii are R1 and R2 respectively, where R1 > R2. The accelerations due to gravity on the surface of these planets are related as -
1) g1 > g2
2) g1 < g2
3) g1 = g2
4) Can't say anything
Q. The focal length of the objective lens of a telescope is 50 cm. If the magnification of the telescope is 25, then the focal length of the eye-piece is -
1) 12.5 cm
2) 5 cm
3) 2 cm
4) 10 cm
Q. Light year is a unit of measurement of -
1) very large distances
2) time interval in years
3) amount of light received on earth in a year
4) mass of atoms
Q. Which one of the following forces is non-central and non-conservative?
1) Frictional force
2) Electric force
3) Gravitational force
4) Mechanical force
Q. Which one of the following is an example of Salt-Crystal growth?
1) Chemical weathering
2) Physical weathering
3) Biological weathering
4) Bio-chemical weathering
Q. The Sun is seen little before is rises and for a short while after it sets. This is because of -
1) total internal reflection
2) atmospheric refraction
3) apparent shift in the direction of Sun
4) dispersion
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