Which of these is a derived unit?
- A. Kilogram
- B. Metre
- C. Newton
- D. Second
Correct Option: Answer is C
Examples of Fundamental Quantities ; Mass, kilogram, kg ; Electric Current, ampere, A ; Temperature, kelvin, K ; Amount of Substance, mole, Mol.
2. 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
Correct Option: Answer is A
When it is cut into two, the two cut pieces will have their own north and south poles since .
3. Consider the wave equation y = 5mm sin [1cm−1 x – 60s−1t]. The wave number is?
- A. 0.1 cm−1
- B. 10cm−1
- C. 1.0cm−1
- D. 2cm−1
Correct Option: Answer is C
The angular wave number k = 2π/λ expresses the number of radians in a unit of distance.
4. 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
Correct Option: Answer is A
5. 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
Correct Option: Answer is B
If both the coil and the magnet are stationary, then there is no change in the magnetic flux and hence no current is induced in the coil.
6. Tyres are treaded to?
- A. increase weight of tyres
- B. increase friction
- C. increase its longevity
- D. look good
Correct Option: Answer is B
Helps your vehicle to be able to accelerate smoothly and as well to be able to brake more quickly.
7. A car starts from rest and covers a distance of 40 m in 10 s. Calculated 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
Correct Option: Answer is C
8.
The relationship between the coefficient of linear expansion α and volumetric expansion (γ) is—————–
- A. γ = α−3
- B. γ = α
- C. 3α
- D. γ = α3
Correct Option: Answer is C
volumetric expansion (γ) = 3x Linear expansion
9. Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?
- A. formation of hydrogen bubbles electrode
- B. increase in the resistance of the cell
- C. local action
- D. polarization
Correct Option: Answer is C
If the zinc used in the simple cell is of the impure commercial variety bubbles of hydrogen will be seen coming off the zinc. This is called local action.
10.
A cell whose internal resistance is 0.55Ω 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
Correct Option: Answer is B
Lost voltage = I x R
= 4 x 0.55
= 2.2V
11. Which of the following liquid is a poor conductor of electricity?
- A. molten mercury
- B. molten steel
- C. molten iron
- D. molten copper
Correct Option: Answer is A
Mercury is a heavy, silvery-white liquid metal. Compared to other metals, it is a poor conductor of heat, but a fair conductor of electricity.
12. 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
Correct Option: Answer is A
The equation that establishes a relationship between the amount left undecayed
13. 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
Correct Option: Answer is C
The primary colors of pigment are red, blue, and green.
Mixing these primary colors of pigment gives us the three secondary colors:
red+blue=magenta, red+ green = yellow, and blue + green = cyan
14. 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
Correct Option: Answer is B
The refractive index of water is greater than that of air.
So, A person legs appear to be short while standing in the tank due to refraction.
15. 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
Correct Option: Answer is C
v = f λ to calculate the wave’s velocity.
v = 312 x 1.10
= 343.2m/s