A current of 0.5 A flows through a resistor when connected to a 40 V battery. How much energy is dispatched in 2 minutes?
- A. 2400 J
- B. 9600 J
- C. 1500 J
- D. 1200 J
According to kinetic molecular model in gases,
- A. the particles are closely packed together; they occupy minimum space are usually arranged in a regular pattern
- B. the particles vibrate about fixed positions and are held together by the strong intermolecular bonds between them
- C. the molecules are very far apart and occupy all the spaces made available to them
- D. the particles occur in clusters with molecules slightly further apart
A magnet relay is a device used for?
- A. reading the magnitude of magnetic flux
- B. controlling another circuit carrying larger current
- C. turning in sports
- D. storing magnetic field
When the plate area of a capacitor increases?
- A. the voltage can withstand increase
- B. the capacitance decreases
- C. the capacitance is unaffected
- D. the capacitance increases
A tuning fork having a frequency of 312 Hz emits a wave which has a wavelength of 1.10 m. Calculate the velocity of sound
- A. 312.0 ms\(^{-1}\)
- B. 110.0 ms\(^{-1}\)
- C. 343.2 ms\(^{-1}\)
- D. 686.4 ms\(^{-1}\)
A person standing waist-deep in a swimming pool appears to have short legs because of light?
- A. diffraction
- B. refraction
- C. reflection
- D. interference
The secondary pigments consist of?
- A. blue, green, and violet
- B. yellow, green, and magenta
- C. magenta, yellow, and cyan
- D. red, green, and blue
An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. The half-life is?
- A. 3 days
- B. 2 days
- C. 1 day
- D. 4 days
Which of the following liquid is a poor conductor of electricity?
- A. Distilled water
- B. Tap water
- C. Sea water
- D. Drinking water
A cell whose internal resistance is 0.55\(\Omega\) delivers a current of 4 A to an external resistor. The lost voltage of the cell is?
- A. 4.00 V
- B. 2.20 V
- C. 0.15 V
- D. 8.00 V
Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?
- A. formation of hydrogen bubbles on the electrode
- B. increase in the resistance of the cell
- C. local action
- D. polarization
The relationship between the coefficient of linear expansion \(\alpha\) and volumetric expansion (\(\gamma\)) is—————–
- A. \(\gamma\) = \(\alpha ^{-3}\)
- B. \(\gamma\) = \(\alpha\)
- C. 3\(\alpha\)
- D. \(\gamma\) = \(\alpha ^{3}\)
A car starts from rest and covers a distance of 40 m in 10 s. Calculate the magnitude of its acceleration
- A. 3.20 ms\(^{-2}\)
- B. 0.25 ms\(^{-2}\)
- C. 0.80 ms\(^{-2}\)
- D. 4.00 ms\(^{-2}\)
Tyres are treaded to?
- A. increase weight of tyres
- B. increase friction
- C. increase its longevity
- D. look good
A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when?
- A. the magnet is moved towards the stationary solenoid
- B. there is no relative motion
- C. the magnet is moved away from the stationary solenoid
- D. the solenoid is moved away from the stationary magnet
An object 40 cm high is 30cm from the pin hole camera. If the height of the image formed is 20 cm. What is the distance of the image from the pin height?
- A. 15 cm
- B. 70 cm
- C. 40 cm
- D. 40 cm
Consider the wave equation y = 5mm sin [1cm\(^{-1}\)x – 60s\(^{-1}\)t]. The wave number is?
- A. 0.1 cm\(^{-1}\)
- B. 10cm\(^{-1}\)
- C. 1.0cm\(^{-1}\)
- D. 2cm\(^{-1}\)
A bar magnet is divided into two pieces, which of the following statement is correct?
- A. two new magnets are created
- B. the magnetic field of each separate piece becomes stronger
- C. the electric field is created
- D. the bar magnet is demagnetized
Which of these is a derived unit?
- A. Kilogram
- B. Metre
- C. Newton
- D. Second