IdeasCuriosas - Every Question Deserves an Answer Logo

Questions in physics

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] A bicycle is traveling at 15 km/h. How many meters will it cover in 30 seconds?

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] Physics (10×1=10) 1. The S.I. unit of Gravitational constant (G) is a) Kg'm's c) Kg'ms² b) Kg 'm²s² d) None of the above 2. Which of the following is Scalar quantity? a) Force b) Velocity d) Temperature c) Acceleration 3. The S.I. unit of electric current is a) Volt c) Ohm b) Ampere d) Coulomb 4. Newton's first law of motion is also known as a) law of inertia c) law of gravitation b) law of acceleration d) None of the above 5. The rate of change of Momentum is called a) Power c) Force b) Energy d) None of the above 6. The force of attraction between two bodies in the universe is called. a) Magnetic Force c) Gravitational Force b) Electrostatic Force d) Nuclear Force 7. The S.I. unit of frequency is a) Watt c) Joule b) Newton d) Hertz 8. The temperature of a body is 212° F. The temperature in Celsius scale is a) 0°C c) 100°C b) 180°C d) None of the above 9. The phenomenon of splitting of white light into seven colour is called a) Reflection b) Refraction d) Diffraction c) Dispersion 10. Which of the following material is good conductor of electricity? a) Wood b) Rubber c) Copper d) Plastic

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] Which quantities decrease as the distance between a planet and the Sun increases? A. tangential speed B. mass C. gravitational force D. area swept out in a day E. distance traveled in a day

[Answered] 1. A block of wood floats on water but sinks in alcohol. Which statement is correct? A) Alcohol is denser than water B) The buoyant force in alcohol is more C) The density of block is less than water but more than alcohol D) The pressure exerted by water is less than alcohol 2. A force of 300 N is applied on a surface of area 50 cm². What is the pressure? A) 6x10 Pa B) 6x10 Pa C) 6×10⁰ Pa D) 6x10 Pa 3. In vacuum, what will be the pressure inside it? A) 760 mm of Hg B) 1 Pa C) 101 KPa D) Zero 4. Why does liquid come out through the needle at high speed when the syringe is pressed? A) Force is reduced B) Force is increased and area is small C) Pressure is reduced D) Density of liquid changes 5. A dam is thicker at the bottom than at the top because A) Water pressure decreases with depth B) Water pressure increases with depth C) The shape of dam looks good D) It stores more water at the top 6. An object weighs 50 N in air and 30 N in water. What is the buoyant force acting on it? A) 20 N B) 80 N C) 30 N D) 50 N 7. In which condition will the greatest pressure be produced? A) 100 N force on 2 m² B) 200 N force on 4 m² C) 400 N force on 5 m² D) 300 N force on 3 m²

[Answered] A stone is immersed in water, and the upthrust exerted on it is found to be 30 N. Determine the weight of the displaced water and the volume of water displaced if the density of water is 1000 kg/m³. (Ans: weight of displaced water : 30 N, volume of water displaced: 0.03 m³)