Top tricky science question.
There are about 26 questions mostly about Physics. These questions are only for practice. The students of Class 6,7,8 and 9 and other classes can also try to attempt these questions.
If you can attempt at least 20 questions correctly then you are also one of the intelligent students or people in Physics.
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Jay Science Jay Nepal😂😂😂😂 (Making You Mind Fresh and Active)
1.Who is known as the father of science?
i. Galileo Galilei
ii. Albert Einstein
iii. Charles Babbage
iv. A.R @ R.R
2.Convert 5×10⁵kg/m³ into g/cm³
i. 50
ii. 5
iii. 500
iv 5000
3.A ball dropped from a certain height strikes the ground in 5 seconds? Calculate the height in meters
i. 12.25
ii. 122.5
iii. 24.5
iv. 245
4.Calculate the distance between a bus moving weight 48 km/hr and a car moving with 36 km/hr in the same direction after 1 minute.
i. 10 metres
ii. 100 metres
iii. 500 meters
iv. 1000 metres
5.Calculate the relative velocity of body A with respect to body B moving with 144km/hr and 72km/hr respectively in the opposite direction
i. 85 m/s
ii. 73 km/hr
iii. 60 m/s
iv. Both B and c
v. Both A and c
6.Calculate the height gained by a body that is thrown vertically upward with a velocity of 36km/hr.
i. 10.2 m
ii. 20.4 m
iii. 5.10 m
iv. 15.30 m
7.Calculate the power exerted by a body of mass 1 quintal dropped from the height of 120 m in 3.2 minutes
i. 612.5 watt
ii. 3750 watt
iii. 6125 watt
iv. 375 watt
8.Calculate the velocity gained by an object of mass 50 kg that applies the weight of 500N that starts from rest in 4 seconds.
i. 40 km/hr
ii. 20 km/hr
iii. 72km/hr
iv. 144 km/hr
9.A rigid bar of 12m length is applied to lift a load of 600N places at 300 cm from the fulcrum. Calculate the effort appliedImmersive Reader
i. 20 N
ii. 20000N
iii. 200N
iv. 2000N
10.Calculate the work done by a body of weight 5×10⁷ dynes dropped from the height of 15 m
i. 7500 joules
ii. 750 joules
iii. 7.5 ×10⁹ joules
iv. 75000 joules
11.Calculate the mass of a body that moves with 4 m/s to convert 100 joules of work done.
i. 25kg
ii. 12.5 kg
iii. 6.25kg
iv. 3.125kg
12.According to the principle of the lever.
i. Ed×E = L/Ld
ii. Ed×E=Ld×L
iii. Ed/E=Ld×L
iv. Ed/E=Ld/L
13.Wheel and axle is a ..... lever
i. 2nd class
ii. 3rd class
iii. 1st class
iv. None of the above
14.VR of a single movable pulley is
i.3
ii. 1
iii. 2
iv. 4
15.If an inclined plane of length 'L' and vertical height covers 'H', which is inclined to angle A with horizontal, its VR is given by
i. H/L
ii. Cosec A
iii. Tan A
iv. H×L
16.Ajay lifts 800N load by using a 1m long crowbar. If the load is at 30 cm, the effort applied to it is 400N. What is the efficiency of the machine?
i. 80%
ii. 75.23%
iii. 85.84%
iv. 85%
17.MA of the nutcracker is
i. greater than 1
ii. less than 1
iii. Equal to 1
iv. None of the above
18.Work is easier to do with
i. Shovel
ii. Tong
iii. Bottle opener
iv. Broom
19.A machine 30% efficient, 1200N load is lifted by an effort of 400N if the distance moved by the load is 20 cm. What is the effort distance?
i. 1m
ii. 2m
iii.3m
iv. 4m
20.The relation between MA and VR of the machine is
i. MA=VR
ii. MA <VR
iii. MA> VR
iv. MA= 2VR
21.The machine having an efficiency of 100% is
i. Bulb
ii. Computer
iii. Electric heater
iv. None of the above
22.Which of the machine is a force multiplier
i. Broom
ii. Single fixed pulley
iii. Screwdriver
iv. Shovel
23.To increase the MA of machine
i. Ed should be increased
ii. Ed should be decreased
iii. Ed and Ld should be made equal
iv. one of the above
24.Pedal of a bicycle is an example of
i. Screw
ii. Wheel and axle
iii. Pulley
iv. None of the above
25.VR of wheel and axle is
i. The radius of wheel/radius of the axle
ii. The radius of axle /radius of the wheel
iii. The radius of wheel × radius of the axle
iv. The radius of wheel /radius of axle +1
26.Efficiency of machine can be increased by
i. Polishing the surface
ii. Reducing the weight of the machine
iii. Using oils in the movable parts of the machine
iv. All of the above
27.Which of the following is true for an ideal machine
i. Efficiency<100%
ii. Efficiency>100%
iii. Efficiency=100%
iv. None of the above
28.A lever with VR of 30 overcome s a load of 1200N with the force of 50 N. What are the MA and efficiency of the lever?
i. MA =22 , efficiency= 80%
ii. MA = 24 , efficiency = 75%
iii. MA= 22 , efficiency = 75%
iv. MA = 24% , efficiency = 80%
Answer:
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