1. The forces, whose lines of action are parallel to each other and act in the same directions, are known as ?

coplaner concurrent forces

coplaner non-concurrent forces

like parallel forces

unlike parallel forces

Answer: like parallel forces

Explanation:


2. One joule means that ?

work is done by a force of 1 N when it displaces a body through 1 m

work is done by a force of 1 kg when it displaces a body through 1 m

work is done by a force of 1 dyne when it displaces a body through 1 cm

work is done by a force of 1 g when it displaces a body through 1 cm

Answer: work is done by a force of 1 N when it displaces a body through 1 m

Explanation:


3. The angle of inclination of the plane at which the body begins to move down the plane, is called ?

angle of friction

angle of repose

angle of projection

none of these

Answer: angle of friction

Explanation:


4. The length of a second's pendulum is ?

94.9 cm

99.4 cm

100 cm

101 cm

Answer: 99.4 cm

Explanation:


5. A framed structure is imperfect, if the number of members are ........... (2j-3) where j is no of joints ?

equal to

less than

greater than

either (b) or (c)

Answer: either (b) or (c)

Explanation:


6. For a self locking machine, the efficiency must be ?

equal to 50%

less than 50%

greater than 50%

100%

Answer: less than 50%

Explanation:


7. The centre of gravity of a right circular solid cone is at a distance of.........from its base, measured along the vertical axis ?

h/2

h/3

h/4

h/6

Answer: h/4

Explanation:


8. The wheels of a moving car possess ?

potential energy only

kinetic energy of translation only

kinetic energy of rotation only

kinetic energy of translation and rotation both

Answer: kinetic energy of translation and rotation both

Explanation:


9. Which of the following statement is correct ?

The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation

The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity

The velocity of the particle moving with simple harmonic motion is zero at the mean position

The acceleration of the particle moving with simple harmonic motion is maximum at the mean position

Answer: The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation

Explanation:


10. The velocity ratio of a simple screw jack with p as the pitch of the screw and I as the length of effort arm, is ?

2?l/p

?/P

2?P/l

2?p/l

Answer: 2?l/p

Explanation: