Technology Problems Quiz




This Quiz have Tecnology problems.The level os this poblems is easy, but you have to now some formulas. If you are ready, we can start!!!

Questions and Answers

Q 1 - The force of a dog is 400 N and it has an acceleration of 2 m/s^2. What mass it has? (F=m*a)

A - 200 kg

B - 200 g

C - 20 kg

D - 20 g

Answer : A

Explanation

F= m*a m=F/a m= 400 / 2= 200 kg

Q 2 - One car has traveled 50 m in 10s. At what speed it traveled? (X=v*t) .

A - 50 km/h

B - 50 m/s

C - 5 m/s

D - 5 km/h

Answer : C

Explanation

X= v*t V=x/t V= 50 / 10 = 5 m/s

Q 3 On book have a mass of 3 kg. What weight it has? (P= m*g) (g= 9,8 m/s^2)

A - 34 N

B - 29,4 kg

C - 29,4 N

D - 34 kg

Answer : C

Explanation

P= m*g P= 3*9,8= 29,4 N

Q 4 - One lorry is travelig with a velocity of 5 m/s and it mass is 100 kg. What kinetic energy has it? (Ec= 1*m*v^2/2)

A - 2500 N

B - 1250 kg

C - 2500 J

D - 1250 J

Answer : D

Explanation

Ec= 1*m*v^2/2 Ec= 1*100*5^2/2= 1250 J

Q 5 -One swimmer with a mass of 60 kg is going to jump in a trampoline that has a height of 10 m. What potential energy he has? (Ep= m*g*h) (g= 9,8 m/s^2)

A -5880 J

B -588 KJ

C -588 J

D -5880 KJ

Answer : A

Explanation

Ep= m*g*h Ep= 60*9,8*10= 5880 J

Q 6 - One motorbike has a potency of 11 KW. What work it has in 10 s? (1 KW= 1000W)(P= W/t)

A - 110000 W

B - 11000 KW

C - 11 KW

D -110 W

Answer : A

Explanation

P= W/T W= P*T W= 11000*10= 110000 W

Q 7 - 1 horsepower, how much watts are?

A -1000 W

B - 735 W

C - 730 W

D - 800 W

Answer : B

Explanation

1 CV is 735 W

Q 8 -One engine supplies an electric potency of 30 KW in 7 h. What electric energy it has? (Eel = Pel*t)

A - 21 W

B - 210 W/h

C - 21 KW

D - 210 KW/h

Answer : D

Explanation

Eel = Pel*t Eel= 30*7= 210 Kw/h

Q 9 - In one factory there are two electrics motors with an efficiency of 80% and 40%. What is the total efficancy?

A - 40%

B - 60%

C - 32%

D - 50%

Answer :C

Explanation

% total= 40*80= 3200/100= 32%

Q 10 - One car consumes 6 litres in 100 km and the benzine has a density of 50 kg/l. What consumption it has in kg/km?

A - 3 kg/km

B - 30 kg/km

C - 300 kg/km

D - 3 g/km

Answer : A

Explanation

C total= 6*50/100= 3kg/km


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