The sound waves in the audible range have frequencies in the range of-
- 20 Hz to 20,000 Hz
- 0.5 Hz to 5 Hz
- 1 Hz to 10 Hz
- 20,000 Hz to 40,000 Hz
Which of the following being used for applications such as assessing the depth of oceans, thickness measurement, determination of the position of icebergs, flaw detection in metals, etc?
- Ultrasonic waves
- X-rays
- Light waves
- γ-rays
How do you understand by the term “Binding Energy”?
- The energy released when a nucleus is formed from protons and neutrons
- The force of attraction between an electron in the first orbit and the nucleus
- Electron belonging to the same major energy level
- The energy associated with a photon
Which of the following statements is wrong?
- Ionic bonds are non-rigid and non-directional
- Compounds formed by ionic bonds are non-conductors of electricity
- Ionic bonds are formed by transfer of electrons from a metal to a non-metal atom
- Compounds formed by ionic bonds are hard and brittle
Arrange the following materials in the order of decreasing conductivity:- Silicon, Glass, Aluminium, Silver –
- Glass, Silicon, Aluminium, Silver
- Aluminum, Silver, Glass, Silicon
- Silver, Silicon, Aluminium, Glass
- Silver, Aluminium, Silicon, Glass
If a barometer carries water instead of mercury, then the height of the column for a pressure equivalent to 75 cm of mercury would be-
- 1050 cm
- 1020 cm
- 1000 cm
- 5.5 cm
The term EURO-II in the context of modern cars refers to-
- Emission from cars
- Speed of cars
- Fuel efficiency
- Torque available
An electric heater of 1 kW rating is used to heat water every day for 2 hours. In 10 days, it will consume-
- 20 kWh
- 2 kWh
- 0.2 kWh
- 200 kWh
A stove consumes 1 gram of kerosene in 48 seconds. if the calorific value of kerosene is 48 KJ / gm, then the power of consumption of the stove in kW is-
- 0.1
- 1.5
- 1
- 0.5
If acceleration due to gravity is 10 m/ sec², then the potential energy of a body of mass 1 kg kept at a height of 5 meters is-
- 50 Joules
- 500 Joules
- 100 Joules
- 10 Joules
A boat weighing 200 kg floats on water. The weight of water displaced would be-
- 220 kg
- 0 kg
- 180 kg
- 200 kg