1. The dimensions of power are
- [MLT^-2]
- [MLT^-3]
- [M^2L^2T^-2]
- [ML^2T-3]
2. The significant figures in 34.678 are
- 4
- 3
- 5
- 2
3. Two forces are acting together on an object. The magnitude of their resultant is minimum, when the angle between the forces is
- 120°
- 180°
- 45°
- 60°
4. If the scalar product of two vectors is 2√3 and the magnitude of their vector product is 2.The angle between them is
- 30 °
- 60°
- 180°
- 120°
5. A car starts from rest and covers a distance of 100m in one second with uniform acceleration. Its acceleration is
- 100m/s^2
- 200m/s^2
- 300m/s ^2
- 50m/s^2
6. A ball rolls off the edge of a table. The horizontal component of the ball’s velocity remains constant during its entire trajectory because
- The net force acting on the ball is zero.
- The ball is not acted upon by a force in the horizontal direction
- The ball is acted upon by a force in the horizontal direction
- The ball is acted upon by a force in the only vertical direction
7. Which of the following is the example of conservative force?
- Tension in the string.
- Propulsion force of rocket
- Gravitational field
- Restoring force in compressed spring
8. Anybody requires _______ escape velocity, to escape from the gravitational pull of the mars
- 2.4km/s
- 4.3km/s
- 5km/s
- 10.4km/s
9. In dryer, water is pushed out of wet clothes due to
- Abundance of centripetal force
- Lack of centripetal force
- Friction
- Retarding force
10. The SI unit of co-efficient of viscosity is
- kgm^-1s^-1
- kgm^-1s^-2
- kgm^-2s^-1
- kgm^-3s^-2
11. A stone of mass 16kg is attached to a string 144 m long and is whirled in a horizontal circle. The maximum tension the string can withstand is 16N. The maximum velocity of revolution that can be given to the stone without breaking it, will be
- 20m/s
- 16m/s
- 14m/s
- 12m/s
12. The property of fluid by which its own molecules are attracted is said to be
- Adhesion
- Cohesion
- Viscosity
- Surface tension
13. A simple pendulum is moved from the earth to the moon. How does it changes the period of oscillations? (Accelration due to gravity on moon=1.6m/s^2)
- The period is increased by factor √6.
- The period is increased by factor four
- The period is decreased by factor √6.
- The period remains the same.
14. Which of the following conditions is best for cooking purpose?
- Isobaric
- Isochoric
- Adiabatic
- Isothermal
15. What would be the efficiency of a carnot engine operating with boiling water as one reservoir and a freezing mixture of ice and water as the other reservoir?
- 27%
- 67%
- 12%
- 100%
16. Power of magnifying glasses is given by
- f+p
- 1-(f/d)
- 1+fd
17. Optically active substances are those substances which
- Produce polarized light
- Produce double refraction
- Rotate the plane of polarization of polarized light
- Convert a plane polarized light in circulatory polarized light