1. The peak voltage in the output of a half-wave dioderectifier fed with a sinusoidal signal without filter is 10V.The d.ccomponent of the output voltage is [2004]

2. Radio waves of constant amplitude can be generatedwith [1989]

3. Which one of the following statement is FALSE?[2010]

4. The intrinsic semiconductor becomes an insulatorat [2001]

5. A thin uniform circular ring is rolling down aninclined plane of inclination 30° without slippingItslinear acceleration along the inclination plane will be[1994]

6. The moment of inertia of a thin uniform rod ofmass M and length L about an axis passing through itsmidpoint and perpendicular to its length is I 0Itsmoment of inertia about an axis passing through one ofits ends and perpendicular to its length is [2011]

7. When n-type semiconductor is heated [1989]

8. A circular platform is mounted on a frictionlessvertical axleIts radius R= 2 m and its moment of inertiaabout the axle is 200 kgm 2It is initially at restA 50 kgman stands on the edge of the platform and begins towalk along the edge at the speed of 1 ms-“1 relative to thegroundTime taken by the man to complete onerevolution is: [2012M][NEET2013]

9. A circular disk of moment of inertia I t is rotating ina horizontal plane - its symmetry axis - with a constantangular speed ωiAnother disk of moment of inertia I b isdropped coaxially onto the rotating diskInitially thesecond disk has zero angular speedEventually both thedisks rotate with a constant angular speed ω fTheenergy lost by the initially rotating disk to friction is:[2010]

10. The voltage gain of an amplifier with 9% negativefeedback is 10The voltage gain without feedback will be[2008]

11. For an electronic valve - the plate current Iand platevoltage Vin the space charge limited region are relatedas [1992]

12. In carbon monoxide molecule - the carbon and theoxygen atoms are separated by a distance 1.12 × 10 -“10mThe distance of the centre of mass - from the carbonatom is [1997]

13. A drum of radius Rand mass M - rolls down withoutslipping along an inclined plane of angle θThe frictionalforce [2005]

14. To obtain a p-type germanium semiconductor - itmust be doped with [1997]

15. In a common base amplifier the phase differencebetween the input signal voltage and the output voltageis [1990]

16. For a common emitter circuit if0.98 CEIIthencurrent gain for common emitter circuit will be [2001]

17. Zener diode is used for [2005]

18. In a p-n junction photocell - the value of the photoelectromotive force produced by monochromatic light isproportional to [2004]

19. For amplification by a triode - the signal to beamplified is given to [1992

20. Three masses are placed on the x-axis: 300 g atorigin - 500 g at x = 40 cm and 400 g at x = 70 cmThedistance of the centre of mass from the origin is:[2012M]

21. Angular momentum is [1994]

22. When a mass is rotating in a plane about a fixedpoint - its angular momentum is directed along: [2012]

23. The output of OR gate is 1 [2004]

24. p-n junction is said to be forward biased - when[1988]

25. A solid sphere of radius R is placed on a smoothhorizontal surfaceA horizontal force F is applied atheight h from the lowest pointFor the maximumacceleration of the centre of mass - [2002]