Which of the following is not a product of nuclear fusion?
- A. X β ray
- B. Y βray
- C. Ξ± β particles
- D. neutron
The process by which protons are converted into helium atoms with a tremendous release of energy is called?
- A. thermionic emission
- B. nuclear fission
- C. thermonuclear fusion
- D. photoelectric emission
Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules.
- A. Transitional Motion
- B. Rotational Motion
- C. Brownian Motion
- D. Oscillatory Motion
Water of mass 150g at 60\(^o\)c is added to 300g of water at 20\(^o\)c and the mixture is well stirred. Calculate the temperature of the mixture.(neglect heat losses to the surroundings)
- A. 33\(^o\)c
- B. 40\(^o\)c
- C. 25\(^o\)c
- D. 10\(^o\)c
Mercury which is spilled onto a glass surface forms ball-like shapes because____.
- A. Mercury is a metal
- B. The cohesive force between its molecules is greater than the adhesive force between mercury and glass molecules
- C. The cohesive force between its molecules is less than the adhesive force between mercury and glass molecules
- D. The viscosity of mercury is height
A 40W instrument has a resistance 90 Ohms. On what voltage should it be operated normally
- A. 60V
- B. 150V
- C. 225V
- D. 360V
Which of the following is an essential physical property of the wires uses for making fuses ?
- A. Low density
- B. Hypothermal conductivity
- C. Low electrical resistivity
- D. Low melting point
A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m, how far away is the hill?
- A. 330.0m
- B. 335.4m
- C. 660.0m
- D. 670.8m
A solid cube of side 50cm and mass 75kg floats in a liquid with \(\frac{1}{3}\) of its height above the liquid surface. The relative density of the liquid is?
- A. 0.33
- B. 0.50
- C. 0.67
- D. 0.90
Which of the following concepts is not an evidence of the particles nature of matter?
- A. Diffusion
- B. Brownian motion
- C. Diffraction
- D. Esterification
The product of force and time is?
- A. Impulse
- B. Momentum
- C. Inertia
- D. Friction
Temperature is the property of a body which is proportional to the ____.
- A. total kinetic energy of its molecules
- B. average kinetic energy of its molecules
- C. average speed of its molecules
- D. maximum speed of its molecules
What flows to the positively charged conductor by connecting it to the earth?
- A. Electrons
- B. Ion
- C. Neutron
- D. Proton
An electric heating coil rated at 1Kw is used to heat 2kg of water for 2 minutes. The initial water temperature is 30\(^o\)C. Taking the specific heat of the water as 4,000Jkg \(^{-1}\) and neglecting that of the container, the final water temperature is
- A. 15.0\(^o\)C
- B. 45.0\(^o\)C
- C. 52.5\(^o\)C
- D. 60.0\(^o\)C
A beam of light is incident from air to water at an angle of 30\(^o\). Find the angle of refraction if the refractive index of water is 4/3
- A. 15\(^o\)
- B. 18\(^o\)
- C. 22\(^o\)
- D. 24\(^o\)
The resistance of a 40W car head lamp, drawing current from a 12V battery is ____.
- A. 0.3Ξ©
- B. 3.3Ξ©
- C. 3.6Ξ©
- D. 4.8Ξ©
A force of 5N acts at a point Y on a rod XYZ as shown in this diagram. If XYZ is 2m, what is the moment of the force about point X?
- A. 0Nm
- B. 3Nm
- C. 7Nm
- D. 10Nm
The energy needed to move a unit positive charge around a complete electric circuit is called the
- A. electromotive force
- B. electric potential difference
- C. electric energy
- D. kinetic energy
An object is placed 20cm from a concave mirror of focal length 10cm. The linear magnification of the image produced is?
- A. 0
- B. \(\frac{1}{2}\)
- C. 1
- D. 2
The tendency of a body to remain at rest when a force is applied to it is called.
- A. Impulse
- B. Momentum
- C. Inertia
- D. Friction
A 20kg mass is to be pulled up a slope inclined at 30Β° to the horizontal. If efficiency of the plane is 75%. The force required to pull the load up the plane is J [g=10ms\(^{β 2}\)]
- A. 87N
- B. 73.5N
- C. 133.3N
- D. 533.2N