physics

The size of the hole of a pin hole camera is increased. The resultant image formed becomes?

A. sharper B. reduced in size C. enlarged D. blurred Correct Answer: Option D D. blurred

6 years ago

In the wave equation y = Eo sin(299t – π), Eo represents the.

A. amplitude B. frequency C. period D. wavelength Correct Answer: Option A A. amplitude

6 years ago

A radio wave has a wavelength of 150m. If the velocity of radio waves is free spaces is 3 x 10^8 m/s, calculate the frequency of the radio wave.

A. 4.50 x 10^10Hz B. 5.0 x 10^9Hz C. 4.5 x 10^9Hz D. 2.0 x 10^6Hz Correct Answer: Option D…

6 years ago

A slinky spring fixed at one end is placed horizontally on a table. The free end is displaced parallel to the table and then released. The resulting wavelength is?

A. transverse B. longitudinal C. stationary D. electromagnetic Correct Answer: Option B B. longitudinal

6 years ago

What type of motion does the skin of a ‘talking’ drum perform when it is struck with a drum stick?

A. Random B. Rational C. Translational D. vibratory Correct Answer: Option D D. vibratory

6 years ago

Calculate the energy required to vapourize 50g of water initially at 80°C.[specific heat capacity of water = 2260Jg‾¹K‾¹] [specific latent heat of vaporization of water = 2260Jg‾¹]

A. 113,000J B. 117,200J C. 234,400J D. 420,000J Correct Answer: Option B B. 117,200J Explanation mcθ + ML = 50…

6 years ago

Water of mass 120g at 50°C is added to 200g of water at 10°C and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]

A. 60°C B. 40°C C. 25°C D. 10°C Correct Answer: Option C C. 25°C

6 years ago

The silver coating on the inside of a vacuum flask reduces heat loss by?

A. conduction B. radiation C. condensation D. convention Correct Answer: Option B B. radiation

6 years ago

The ice and steam points of a certain thermometer are -20°C and 100°C respectively. Calculate the Celsius temperature corresponding to 70°C on the thermometer

A. 84.0° B. 75.0° C. 64.0° D. 58.0° Correct Answer: Option B Explanation (70−20)/(100−20) = (θ−0)/(100−0) θ = (90×100)/120 =…

6 years ago

Which of the following actions will improve the efficiency of the pulley system?

A. reducing the mass of the pulley B. increasing the friction force between the string and the pulley C. increasing…

6 years ago
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