Machines and Graphics Objective Type Questions and Answers

21 A disc of mass 4 kg, radius 0.5m and moment of inertia 3 kg-m2 rolls on a horizontal surface so that its center moves with speed 5 m/see. Kinetic energy of the disc is

A 50 J

B 150 J

C 200 J

D 400 J

View Answer

Answer: 200 J

22 When a circular wheel rolls on a straight track, then the shape of body centrode and space centrode respectively are

A straight line and parabola

B straight line and circle

C circle and straight line

D circle and parabola

View Answer

Answer: circle and straight line

23 At the instantaneous center, the velocity of the moving lamina at any instant is

A Zero

B Maximum

C Minimum

D Varying

View Answer

Answer: 464 J

24 For a given velocity of a projectile, the range is maximum when the angle of projection is

A 30°

B 45°

C 90°

D 0°

View Answer

Answer: 45°

25 A stone is thrown vertically upwards with a vertical velocity of 49 m/sec. It returns to the ground in

A 5 sec

B 8 sec

C 10 sec

D 20 sec

View Answer

Answer: 10 sec

26 If a projectile is fired with an initial velocity of 10 m/sec at an angle of 60° to the horizontal, its horizontal and vertical velocity at the highest point of trajectory are

A 0 and 5 m/sec

B 5 m/sec and 0

C 5 V3 m/sec and 0

D 5 and 5V3 m/sec

View Answer

Answer: 5 m/sec and 0

27 In a simple harmonic motion, the position of equilibrium is always

A Stable

B Unstable

C Neutral

D None Of The Above

View Answer

Answer: Stable

28 If A is the amplitude of particle executing simple harmonic motion, then the total energy E of the particle is

A proportional to A

B proportional to A2

C proportional to 1/A2

D independent of A

View Answer

Answer: proportional to A2

29 A particle of mass 2 kg executes simple harmonic motion of frequency 6/71 Hz and amplitude 0.25 m. Its maximum kinetic energy is

A 4.5 J

B 9.0 J

C 12.0 J

D 18.0 J

View Answer

Answer: 9.0 J

30 If the kinetic energy and potential energy of a simple harmonic oscillator of amplitude A are both equal to half the total energy, then the displacement is equal to

A A

B A/2

C A/V2

D AV2

View Answer

Answer: A/V2

31 Time period and length of a seconds pendulum respectively are

A 1 sec and 99.4 cm

B 1 sec and 92.7 cm

C 2 sec and 99.4 cm

D 2 sec and 92.7 cm

View Answer

Answer: 2 sec and 99.4 cm

32 A particle is executing simple harmonic motion in a line 1.0 m long. If the time of one complete vibration is 1 sec, then the maximum velocity of the particle is

A 1.00 m/sec

B 1.57 m/sec

C 3.14 m/sec

D 6.28 m/sec

View Answer