A clinical thermometer is different from other mercury in glass thermometers owing to
- A. the constriction on its stem
- B. the grade of mercury used in it
- C. its long stem
- D. its wide range of temperatures
A piece of iron weights 250 N in air and 200 N in a liquid of density 1000 kgm-3. the volume of the iron is?
- A. 5.0 x 10-3 m-3
- B. 4.5 x 10-3 m-3
- C. 2.5 x 10-3 m-3
- D. 2.0 x 10-3 m-3
A reservoir 500 m deep is filled with a fluid of density 850 kgm-3. If the atmospheric pressure is 1.05 x 105 Nm-2, the pressure at the bottom of the reservoir is.
[g = 10ms-2]
- A. 4.72 x 106 Nm-2
- B. 4.36 x 106 Nm-2
- C. 4.28 x 106 Nm-2
- D. 4.25 x 106 Nm-2
A machine has a velocity ratio of 4. if it requires 800 N to overcome a load of 1600 N,what is the efficiency of the machine?
- A. 60%
- B. 50%
- C. 40%
- D. 2%
Two spheres of masses 5.0 kg and 10.0 kg are 0.3 m apart. Calculate the force of attraction between them?
[G = 6.67 X 10-11 Nm2 Kg\(^{-2}\)]
- A. 3.50 x 10-10N
- B. 3.71 x 10-8 N
- C. 3.57 x 10-2N
- D. 4.00 x 102N
A car of mass 1500 kg goes round a circular curve of radius 50m at a speed of 40 ms-1. The magnitude of the centripetal force on the car is ?
- A. 4.8 x 104 N
- B. 4.8 x 103 N
- C. 1.2 x 103 N
- D. 1.2 x 102 N
A gramophone record takes 5s to reach its constant angular velocity of 4\(\pi\) rads-1 from rest. Find its constant angular acceleration.
- A. 0.4\(\pi\) rads-2
- B. 0.8\(\pi\) rads-2
- C. 1.3\(\pi\) rads-2
- D. 20.0\(\pi\) rads-2
The unit of moment of a couple can be expressed in?
- A. N m-1
- B. N m-2
- C. N m
- D. N m2
A person can focus objects when they lie beyond 75 cm from his eyes. The focal length of the lens required to reduce his least distance of distinct vision to 25 cm is?
- A. 37.50 cm
- B. 75.00 cm
- C. 18.75
- D. 25.00 cm
The wavelength of the first overtone of a note in a closed pipe of length 33 cm is?
- A. 33 cm
- B. 44 cm
- C. 22 cm
- D. 17 cm
Non-luminous object can be seen because they
- A. reflect light
- B. are near
- C. are polished
- D. emit light
A submarine is observed to rise from a real depth off 80 m to 60 m in water. calculate the change in apparent depth.
[Refraction index of water (4)/3]
- A. 45 m
- B. 80 m
- C. 15 m
- D. 60 m
An object placed 10cm from a concave mirror of focal length 5cm would have its image
- A. at the centre of convature
- B. at the radius of curvature
- C. at infinity
- D. 10 cm from the focus
A p-n junction diode is used as?
- A. a rectifier in a d.c circuit
- B. an amplifier in d.c circuit
- C. an anplifier in an a.c circuit
- D. a rectifier in an a.c circuit
A certain manufacturer wishes to make an n-type semiconductor. Which materials would he select for doping?
- A. boron and antimony
- B. boron and sodium
- C. aluminium and indium
- D. arsenic and antimony
I. The number of neutrons released exceeds the number that caused the fission.
II. There is loss of mass.
III. Energy is produced.
IV. Smaller nuclei merge to form larger nuclei
which of the statement above are correct about nuclear fission?
- A. II,III and IV only
- B. I, II and IV only
- C. I,II and III only
- D. I, III and IV only
The theory of electronic conduction in solids, which satisfactorily explains the properties of conductors, insulators and semi-conductor,is?
- A. string theory
- B. particle theory
- C. group theory
- D. band theory
A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?
- A. (15)/16
- B. (1)/16
- C. (3)/4
- D. (1)/4
One of the properties of gamma rays is that they are?
- A. neutral
- B. massive
- C. positively charged
- D. negatively charged
The battery connection that permits current to flow across a p-n junction is called?
- A. reverse baised
- B. forward baised
- C. amplification.
- D. rectification
The process through which free electrons leave the surface of hot metal is known as?
- A. photon emission
- B. photo emission
- C. thermionic emission
- D. electron emission