class 7 science

54 km/h = …. m/s

• 10

• 20

• 15

• 18

1) Which if the following is an example of circular motion?

• Motion of a moving fan

• Motion of a swing

• Motion of a pendulum

• Motion of a mosquito in air

1) A superfast train with constant speed covers a distance of 135 km in 1.5 hour. What would be its speed?

• 120 km/h

• 100 km/h

• 105 km/h

• 90 km/h

1) The basic unit of speed is

• Km/min

• km/h

• m/min

• m/s

1) Which of the following is not the unit of speed?

• Km/h

• km/s

• m/s

• m/s²

1) On which effect of an electric current does a fuse work?

• Thermal

• Physical

• Magnetic

• Chemical

1) In which of the following devices is an electromagnet used?

• Magnetic compass

• Electric bell

• Electric bulb

• Room heater

1) Which of the following devices works on the principle of thermal effect of the electric current?

• Electric geyser

• Electromagnet

• Electric switch

• Electric cell

1) Which type of image is obtained in the plane mirror?

• Inverted

• Virtual

• Real

• Magnified

1) With what is the image always obtained virtual?

• Concave mirror

• Concave lens

• Convex lens

• None of the given