Question 2 :
Which of the statement is not true for a machine ?
Question 3 :
An actual pulley system always has mechanical advantage less than velocity ratio. It is because :
Question 4 :
Which of the statement is not true for an actual machine?
Question 5 :
A beam of electrons has an energy of 1 joule. How many electrons are in the beam ? [1 eV = 1.6 x 10$^{-19}$]
Question 6 :
When we want to use a machine as a force multiplier then,
Question 8 :
A boy drags a load ‘L’ along horizontal plane AB by applying a force F. The boy does
Question 9 :
The correct relationship between the mechanical advantage (M.A.), velocity ratio (V.R.) and efficiency (n) is:
Question 10 :
A pulley system has a velocity ratio 3. If lifts a load of 150 N by an effort of 60 N. Is the pulley system ideal?
Question 11 :
The graph between V/I for a conductor is a straight line. The slope of the graph represents :
Question 12 :
The presence of magnetic field at a point can be detected by :
Question 14 :
The angle of deviation is maximum for ……. when the dispersion of polychromatic light takes place
Question 15 :
In an electrolyte if ({tex}n_1{/tex}) cations each of charge ({tex}q_1{/tex}) moves in one Direction and ({tex}n_2{/tex}) anions each of ({tex}q_2{/tex}) moves in opposite direction in time t, then the current in the electrolyte is given by
Question 16 :
An electric appliance has a rating of 1000 W – 200 V. The resistance of the element of electric appliance is :
Question 17 :
A conductor at 4.2 K is found to offer no resistance. Such a conductor is called
Question 20 :
During the Sunset the colour which scatters closest to the eye of observer is:
Question 21 :
The amplitude of a sound wave is increased from 1 mm to 2 mm. The loudness of the sound will:
Question 22 :
Water from a tap is allowed to fall in a vessel with a thin neck. The pitch of sound produced by falling water with the volume of water in the vessel.
Question 23 :
Two sounds of same loudness and same pitch produced by two different instruments differ in their:
Question 24 : Figure below shows the distance-displacement graph of two waves A and B. Compare the wavelength of the two waves.<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/ICSE%20-%20Class%2010%20/5fdc839571caf63cfc5493bf" />
Question 25 :
A wire stretched between two fixed supports is plucked exactly in the middle and then released. It executes (neglect the resistance of the medium):
Question 26 :
Two notes are produced from a flute and piano, such that they have same loudness and same pitch. The notes so produced differ in their :
Question 27 :
A tuning fork has a frequency of 212 Hz. It will produce resonance in a wooden board of frequency
Question 28 :
The speed (v) of a longitudinal wave in a gas gaseous medium of density(d), at a pressure( P) is given as
Question 29 :
Class-10 Goyal Brothers Sound The voice of women is shrill as compared to men because of the difference in their :
Question 31 :
A convex lens will form a virtual, erect and enlarged image, when the object is :
Question 32 :
A total reflecting equilateral prism can be used to deviate a ray of light through:
Question 33 :
In the spectrum of white light by a prism, the colour of the extreme end opposite to the base of prism is:
Question 34 :
For total internal reflection to take place a ray of light must :
Question 36 :
The frequency range of visible light is from {tex} 3.75 \times 10^{14} \mathrm{~Hz} {/tex} to {tex} 7.5 \times 10^{14} \mathrm{~Hz} {/tex}. Calculate its wavelength range. Take the speed of light {tex} =3 \times 10^{8} \mathrm{~m} / \mathrm{s} {/tex}
Question 37 :
When a ray of light enters into another optical medium, its wavelength and velocity change. The material in which wavelength and velocity decrease maximum, when the ray is travelling through air is :
Question 38 :
When a beam of light strikes a glass slab a part of it is :
Question 39 :
Calculate the frequency of yellow light of wavelength {tex} 550 \mathrm{nm} {/tex}. The speed of light is {tex} 3 \mathrm{x} {/tex} {tex} 10^{8} \mathrm{~ms}^{-1} {/tex}
Question 40 :
A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incidence is:
