BCS Preli CSS sss 1 / 15 1. Why are the soles of the shoes treaded? a. To give the shoes more protection b. To decrease friction c. To increase friction d. To increase life of the shoes ffdsfdsfds 2 / 15 2. Which force moves an aircraft through the air?Which force moves an aircraft through the air? a. Lift Force b. Drag Force c. Thrust Force d. Gravity Force 3 / 15 3. Which of the following is NOT based on the heating effect of current? a. Electric heater b. Electric bulb (with filament) c. Electric iron d. Microwave 4 / 15 4. The value of one Angstrom is (in micron) a. 10^4 micron b. 10^6 micron c. 10^10 micron d. 10^-2 micron 5 / 15 5. At which point of the Earth is there no gravity? a. At North and South Pole b. At equator c. At equator d. At centre of the Earth 6 / 15 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 a. 342 m b. 648 m c. 171 m d. 85.5 m 7 / 15 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: a. 250 w b. 50 w c. 12250 w d. 2250 w 8 / 15 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? a. -35 cm b. 10 cm c. -20 cm d. 20 cm 9 / 15 9. A passenger in a moving bus is thrown forward when the bus suddenly stops. This is explained a. by Newton's first law b. by Newton's second law c. by Newton's third law d. by the principle of conservation of momentum 10 / 15 10. What type of waves are light wave? a. Transverse wave b. Longitudinal wave c. Both A & B d. None 11 / 15 11. A sinusoidal transverse wave is travelling on a string. Any point on the string moves in a. SHM with the same angular frequency as that of the wave b. SHM with a different frequency than that of the wave c. Uniform circular motion with the same angular speed as that of the wave d. Uniform circular motion with a different angular speed than that of the wave 12 / 15 12. Centripetal force is responsible to a. independent motion of the object in space b. keep the body moving along the circular path c. fly the object along a straight line d. More than one of the above 13 / 15 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? a. 1 and 2 only b. 2 only c. I and 3 only d. 1, 2, and 3 14 / 15 14. Sl unit of electric current is a. Candela b. Amplifier c. Ampere d. Kelvin 15 / 15 15. নিচের কোনটি অ্যারোম্যাটিক যৌগ? a. . b. . c. . d. . Your score is LinkedIn Facebook