physics

The absolute zero temperature is defined as the temperature at which?

A. thermal motion ceases B. the temperature of a gas is 273°C C. ice melts D. the volume of a…

5 years ago

An object weighs 10.0 N in air and 7.0 N in water. What is its weight when immersed in a liquid of relative density 1.5?

A. 4.50N B. 4.67N C. 5.50N D. 6.67N E. 8.50N Correct Answer: Option C - 5.50N Explanation: Upthrust in water…

5 years ago

A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation?

A. 0.02s B. 0.20s C. 0.83s D. 1.20s E. 50.00s Correct Answer: Option D - 1.20s Explanation T = t/no.…

5 years ago

Which of the following are contact forces?

I. Force of tension II. Force of friction. III. Magnetic force III Force of reaction. A. I,II and III only…

5 years ago

Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube?

A. metre rule B. A pair of calipers C. A micrometer screw gauge D. A tape rule E. A set…

5 years ago

Which of the following has the highest surface tension?

A. cold water B. soapy water C. warm water D. oily water E. salty water Correct Answer: Option A -…

5 years ago

The work function of a metal is 4.65ev and the metal is illuminated with a radiation of 6.86ev. What is the kinetic energy of the electrons ejected from the surface of the metal?

A. 1.48ev B. 2.21ev C. 4.42ev D. 5.75ev E. 11.51ev Correct Answer: Option B = 2.21ev Explanation K.E = ½mv²…

5 years ago

The half-life of a radioactive substance is 2 seconds. Calculate the decay constant?

A. 0.035s−¹ B. 0.151s−¹ C. 0.347s−¹ D. 0.576s−¹ E. 1.386s−¹ Correct Answer: Option C - 0.347s−¹ Explanation λ=0.693/T½ = 0.6932…

5 years ago