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1. Why are the soles of the shoes treaded?

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2. Which force moves an aircraft through the air?Which force moves an aircraft through the air?

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3. Which of the following is NOT based on the heating effect of current?

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4. The value of one Angstrom is
(in micron)

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5. At which point of the Earth is there no gravity?

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6. An echo returned in 2s. What is the distance of the reflecting surface from the source,
given that the speed of the sound is 342 ms

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7. A machine gun fires 60 bullets per minute with a velocity of 700 m/s. If each bullet has a
mass of 50 g. the power developed by the gun is:

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8. An object is placed at a distance of 10 cm in front of a double convex lens made of glass of refractive
index 1.5. Both the radii of curvature of the lens are 20 cm in magnitude. What is the position of the
image formed?

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9. A passenger in a moving bus is thrown forward when the bus suddenly stops. This is explained

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10. What type of waves are light wave?

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11. A sinusoidal transverse wave is travelling on a string. Any point on the string moves in

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12. Centripetal force is responsible to

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13. Consider the following:
1. Water is more viscous than blood.
2. Blood is more viscous than water.
3. They cannot be compared.
Which of the above is the best relation between the viscosities of blood and water?

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14. Sl unit of electric current is

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15. নিচের কোনটি অ্যারোম্যাটিক যৌগ?

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