Physics
Work and Energy
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#1 Work done by a constant force is:
A) $W=Fs\cos\theta$
B) $W=Fs\sin\theta$
C) $W=F/s$
D) $W=F+s$
Answer: A
#2 SI unit of work is:
A) joule
B) watt
C) newton
D) pascal
Answer: A
#3 If $\theta=90^\circ$ between $\vec F$ and $\vec s$, then work is:
A) $0$
B) $Fs$
C) $-Fs$
D) $F/s$
Answer: A
#4 Work is a:
A) scalar
B) vector
C) tensor
D) pseudoscalar
Answer: A
#5 Power is defined as:
A) $P=\dfrac{dW}{dt}$
B) $P=Wd$
C) $P=\dfrac{dt}{dW}$
D) $P=F\,s$
Answer: A
#6 SI unit of power is:
A) watt
B) joule
C) newton
D) horsepower
Answer: A
#7 $1$ horsepower is about:
A) $746\ \text{W}$
B) $1000\ \text{W}$
C) $550\ \text{W}$
D) $746\ \text{J}$
Answer: A
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