February 27, 2020

XI Physics| Past Paper MCQs |2015

This Video contains solution of the following MCQs.
1. Electron volt is the unit of:
*Power   *voltage     *energy     *charge
2. Intravenous injection by means of silver syringe was initially used by:
*lbn-e-Sina  *Omar Khayyam   *Al-Beruni   *Jabir bin Hayyan
3. The y-components of vector A =15 units when it forms an angle of 50° with positive x-axis is:
*9.6 units    * -9.6 units   * 11.5 units  *-11.5 units
4. The rate of change of linear momentum is:
*acceleration    * torque     *force  * velocity
5. If 'F' be the limiting friction and 'R' the normal reaction. Then co-efficient of static friction ‘μ’ is:
*μ= F/R    *μ= R/F    *μ=FR  *μ= 1/FR
6. When torque acting on a system is zero, this will be constant:
*force    *angular momentum   * linear momentum  * velocity
7. The unit of angular velocity is:
*radian/cm   * metre/sec   * radian/sec  * radian/sect
8. The value of gravitational constant 'G' was determined experimentally by:
*Cavendish    *Newton     *Joules   *Huygen
 9. Newton's rings illustrate the phenomenon of:
*Polarization    *diffraction    * interference   * dispersion
10. The final image formed by a compound microscope is:
*virtual and diminished     *real and diminished
* real and magnified     *virtual and magnified
11. The dimensions of 'G' are
*ML-1T    *ML-2T3   *M-1L3T-2    *ML2T-2
12. In thin film interference, the positions of constructive and destructive interference are interchanged due to:
*Phase coherence   *Phase reversal   *Diffraction  *Interference
13. The angle between centripetal and tangential acceleration in circular motion is:
*180°     * zero    * 90°     *45°
14. The velocity of a wave of wavelength ' λ ' and frequency 'ν' is given by:
* ν/λ  *  λ/ν  *νλ  * 1/λν
15. Polarization of light due to tourmaline crystals takes place because of:
*Reflection   * Absorption    * Refraction   * Collision
16. Two convex lenses of same focal length 'f' are combined together. The focal length of the combines lens is:
*2f     *2⁄f   * 2 + f   * 2 – f
17. This one of the following is not the unit of power:
* horse power    * joule/sec   *kilowatt hour  *foot-pound/sec


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