Three cells each of emf, 1.0 V, and internal resistance, 2 \(\Omega\), are connected in parallel across a 3\(\Omega\) resistor. Determine the current in the resistor.
- A. 0.90A
- B. 0.39A
- C. 0.30A
- D. 0.01A
Which of the following statements about a straight current-carrying wire placed in a uniform magnetic field is correct? The wire experiences —————
- A. maximum motor force if the current reverses its direction
- B. no motor force of it is parallel to the field
- C. no motor force if it is perpendicular to the field
- D. a motor force with constant direction if either the current or the magnetic field is reversed
A body of mass, M, moving with velocity, V, has a wavelength, X, associated with it. This phenomenon is called———-
- A. photoelectric effect
- B. heisenberg's uncertainty principle
- C. compton effect
- D. wave-particles paradox
The magnetic material produced from the chemical combination of metal oxides and has a very high resistance to electric current is called
- A. ferrite substance
- B. paramagnetic substance
- C. ferromagnetic substance
- D. diamagnetic substance
The period of a 10 kHz radio wave traveling at 10\(^{8}\) ms\(^{-1}\) is–
- A. 3.0 x 10\(^{-5}\)s
- B. 1.0 x 10\(^{-4}\) s
- C. 1.0 x 10\(^{4}\)s
- D. 3.0 x 10\(^{4}\)s
Current is passed through two parallel conductors in the same direction. If the conductors are placed near each other, they will——————
- A. move in a circle
- B. repel each other
- C. remain stationary
- D. attract each other
The reason for having a large number of turns in the coil of a moving coil galvanometer is to——–
- A. make the deflection of the needle proportional to the current
- B. increase the sensitivity of the galvanometer
- C. decrease the magnetic flux produced by the magnet
- D. make the permanent magnet stronger
The power of the lens is +2.5D. What is the radius of the curvature?
- A. 2.5 cm
- B. 25.0 cm
- C. 40.0 cm
- D. 80.0 cm
The periodic rise and fall in the intensity of sound produced whn two notes of nearly equal frequencies are sounded together is called?
- A. doppler effect
- B. beat
- C. interference
- D. resonance
An object is placed at different distances, u, from a converging lens of focal length, 15.0cm. For what value of u does the lens act as a microscope?
- A. u = 15cm only
- B. u = 30cm only
- C. M < 15cm only
- D. u > 30cm only
A freely suspended compass needle on the earth’s surface settles in a plane called———-
- A. geographic meridian
- B. magnetic meridian
- C. magnetic declination
- D. isoganals
The efficiency of a wheel and axle is 100% and the ratio of their radii is 5:1. calculate the effort required to lift a load of mass 20kg using this machine, [g = 10 m s\(^{-2}\)]
- A. 20N
- B. 25N
- C. 40N
- D. 100N
Which of the following descriptions of the image formed by a plane mirror is not correct. the image is—-
- A. erect and of the same size as the object
- B. laterally inverted and of the same size as the object
- C. erect and bigger than the object
- D. virtual and if the same size
An example of a mechanical wave is———
- A. water waves
- B. radio waves
- C. x-rays
- D. light rays
Which of the following statement(s) is/are correct about a fixed mass of gas compressed in an inexpansible container;
I. The average speed of the molecules increases
II. The temperature of the gas increases
III. The molecules hit the walls of the container more often than before the compression
- A. I only
- B. I and II only
- C. I, II, and III only
- D. I and III
The joule is equivalent to?
- A. Kg m\(^{2}\) s\(^{-1}\)
- B. Kg\(^{2}\) m s\(^{-2}\)
- C. Kg m\(^{2}\) s\(^{-2}\)
- D. Kg m s\(^{-1}\)
The correct relationship between the displacement, s, of a particle initially at rest in a linear motion and the time, t, is?
- A. s \(\alpha\) t\(^{-2}\)
- B. s \(\alpha\) t\(^{-1}\)
- C. s \(\alpha\) t
- D. s \(\alpha\) t\(^{2}\)
Which of the illustrated graphs above represents a body moving with uniform retardation?
- A. A
- B. B
- C. C
- D. D
Suppose three identical steel balls Q, R, and S, are placed on an undulating ground as illustrated in the diagram above. Which of the balls is/are in neutral equilibrium?
- A. S only
- B. Q only
- C. R only
- D. Q and S only
The linear expansivity, \(\alpha\), and cubic expansivity, \(\gamma\), of a material are related by the equation?
- A. \(\gamma\)=a
- B. \(\gamma\)=3\(\alpha\)
- C. \(\gamma\)=2a
- D. \(\gamma\)=\(\frac{1}{3} \alpha \)
The length of a simple pendulum is increased by a factor of four. By what factor is its period increase?
- A. 0.5\(\pi\)
- B. 2
- C. 2\(\pi\)
- D. 4