50N
100N
175N
210N
Correct answer is B
Efficiency = \( \frac{W(120N)INPUT}{WORK OUTPUT} \times \frac{100}{1} \)
And for incline plane
V.R =\( \frac{1}{Sin\theta} \\
= V.R = \frac{1}{Sin30} =\frac{1}{0.5} = 2 \\
\text{therefore } \frac{60}{120} = \frac{M.A}{2}
=M.A = \frac{120}{100} = 1.2\\
\text{but M.A } = \frac{load}{effort} = \frac{120}{E}\\
\text{therefore} \frac{120}{E} = 1.2 \\
= E =\frac{120}{1.2 } = 100N \\ \)
Therefore Effort up the plane = 100N
An alternating current with a frequency of 100HZ has a period of
0.03sec
0.01sec
0.04sec
0.15sec
Correct answer is B
F = 100HZ, period, T = 1/f = 1/100
= 0.01 sec
The period (T) = 0.01sec
Momentum and Kinetic energy are conserved in
Inelastic collision
Elastic collision
Explosion
Spacecraft
Correct answer is B
Momentum and kinetic energy are conversed in elastic collision
The property of a body to remain at rest or to continue to move in a straight line is known as
force
Impulse
Energy
Inertia
Correct answer is D
Inertia: the property of a body that resists any change to its uniform motion, equivalent to its mass
The normal temperature of human body is record at what ranges?
27°C to 43°C
30°C to 40°
98.4°C only
Between 35°C to 37°C
Correct answer is D
The range of temperature is between 35°C and 43°C but for normal temperature of human body is between the range of 35°C to 37°C respectively