question_answer2) In Youngs experiment, the monochromatic light is used to illuminate two slits A and B as shown. Interference fringes are observed on a screen placed in front of the slits. Now if a thin glass plate is placed normally in the path of beam coming from the slit A, then
question_answer3) A charged particle enters in a magnetic field H with its initial velocity making an angle of \[{{45}^{o}}\] with H. The path of the particle will be
question_answer7) Two identical galvanometers are converted into an ammeter and a milliammeter. The shunt, which has more resistance due to the current passing through the coil will be
question_answer12) A triode valve has an amplification factor of 20 and its plate is given a potential of 300 V. What should be the grid voltage to reduce the plate- current to zero?
question_answer16) Two identical conductors of copper and aluminium are placed in an identical electric field. The magnitude of induced charge in the aluminium will be
question_answer28) The primary winding of a transformer has 500 turns and its secondary has 5000 turns. If primary is connected to a.c. supply of 20 V and 50 Hz, then secondary will have an output of
question_answer32) The average kinetic energy of a gas molecules at \[{{27}^{o}}C\] is \[6.21\times {{10}^{-21}}J.\]. Its average kinetic energy at \[{{227}^{o}}C\] will be
question_answer34) If a cyclist moving with a speed of 4.9 m/s on a level road can take a sharp circular turn of radius 4 m, then coefficient of friction between the cycle tyres and road is
question_answer35) A particle executes simple harmonic motion with an angular velocity and maximum acceleration of \[3.5\text{ }rad/sec\] and \[7.5\text{ }m/{{s}^{2}}\] respectively. Amplitude of the oscillation is
question_answer36) A particle of mass m moving with velocity v colloids with a stationary particle of mass 2w. The speed of the system, after collision, will be
question_answer42) The resistance of a galvanometer is \[50\Omega \] and the current required to give full scale deflection is \[100\mu A\]. In order to convert into an ammeter for reading up to 10 A, it is necessary to put a resistance of
question_answer43) A horizontal platform with an object placed on it is executing SHM in the vertical direction. The amplitude of oscillation is \[3.92\times {{10}^{-3}}\]. What must be the least period of these oscillations, so that the object is not detached from the platform?
question_answer46) A resonance air column of length 20 cm resonates with a tuning fork of frequency 450 Hz. Ignoring the correction, the velocity of sound in air will be
question_answer47) A boy carrying a box on his head is walking on a level road from one place to another on a straight road is doing no work. The statement is
question_answer49) The moment of inertia of a regular circular disc of mass 0.4 kg and radius 100 cm about an axis perpendicular to the plane of the disc and passing through its centre is
question_answer50) Escape velocity of a body when projected from the earths surface is 11.2 km/s. If it is projected at an angle of \[{{50}^{o}}\] from the horizontal, the escape velocity will be
question_answer51) Assertion: Two adjacent conductors, carrying the same positive charge have a potential difference between them. Reason: The potential to which a conductor is raised depends upon the charge. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer52) Assertion: Electrons move away from a region of lower potential to a region of higher potential. Reason: Since an electron has a negative charge. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer53) Assertion: The radiation from the suns surface varies as the fourth power of its absolute temperature. Reason: The sun is not a black body. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer54) Assertion: The second postulate of special relativity refers to the velocity of light in vacuum. Reason: Cerenkov radiation results when particles move through transparent matter at a speed greater than the speed of light in that medium. T is does not violate the second postulate of special relativity. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer55) Assertion: The kinetic energy of the emitted photo-electrons changes only with a change in the frequency of the incident radiations. Reason: The kinetic energy of photo-electrons emitted by a photo-sensitive surface depends upon the intensity of the incident radiation. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer56) Assertion: A hydrogen filled balloon stops rising after it has attained a certain height in the sky. Reason: The atmospheric pressure decreases with height and becomes zero when maximum height is attained. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer57) Assertion: Only a change in magnetic flux will maintain an induced current in the coil. Reason: The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer58) Assertion: Rydbergs constant varies with the mass number of a given element. Reason: The reduced mass of the electron is dependent on the mass of the nucleus only. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer59) Assertion: On a rainy day, it is difficult to drive a car or bus at high speed. Reason: The value of coefficient of friction is lowered due to wetting of the surface. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer60) Assertion: Isotopes of an element can be separated by using a mass spectrometer. Reason: Separation of isotopes is possible because of the difference in electron numbers of isotopes. These questions consist of two statements each, printed as Assertion (A) and Reason (R). While answering these questions you are required to choose any one of the following four responses.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer70) \[{{C}_{6}}{{H}_{6}}\xrightarrow[{{H}_{2}}S{{O}_{4}}]{HN{{O}_{3}}}X\xrightarrow[FeC{{l}_{3}}]{C{{l}_{2}}}Y.\] In the above sequence Y can be
question_answer76) The equivalent weight of phosphoric acid \[({{H}_{3}}P{{O}_{4}})\] in the reaction: \[NaOH+{{H}_{3}}P{{O}_{4}}\to Na{{H}_{2}}P{{O}_{4}}+{{H}_{2}}O\] is
question_answer81) The specific conductivity of \[N/10\text{ }KCl\] solution at \[{{20}^{o}}C\] is \[0.0212\text{ }oh{{m}^{-1}}\text{ }c{{m}^{-1}}\] and the resistance of cell containing this solution at\[{{20}^{o}}C\] is 55 ohm. The cell constant is
question_answer82) If magnesium atom having atomic number 12 has an isotope with mass number 26, then the number of protons, neutrons and electrons respectively of the atom are
question_answer84) The rate constant of a first order reaction is \[3\times {{10}^{-6}}\] per sec. If the initial concentration is 0.10 M, the initial rate of reaction is
question_answer91) Sodium metal crystallises as a body centred cubic lattice with the cell edge\[4.29\overset{\text{o}}{\mathop{\text{A}}}\,\]. What is the radius of sodium atom (in cm)?
question_answer108) The vapour pressure of benzene at a certain temperature is 640 mm of Hg. A non-volatile and non-electrolyte solid weighing 2.175 g is added to 39.08 g of benzene. The vapour pressure of the solution is 600 mm of Hg. What is the molecular weight of solid substance?
question_answer112) Assertion: Identification of cathode and anode is 1 done by the use of a thermometer. Reason: Higher is the value of reduction potential, greater would be its reducing power.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer113) Assertion: Zinc displaces copper from copper sulphate solution. Reason: The \[{{E}^{o}}_{298}\] of Zn is \[-0.76\]volts and that of Cu is \[+0.34\] volts.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer114) Assertion: Reaction of cone. \[{{H}_{2}}S{{O}_{4}}\] on \[NaBr\] and \[Nal\] does not give \[HBr\] and \[HI\]. Reason: \[HBr\]and \[HI\]are oxidised by cone. \[{{H}_{2}}S{{O}_{4}}\] to \[B{{r}_{2}}\] and \[{{I}_{2}}\].
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer116) Assertion: Bond order can assume any value n umber including zero. Reason: Higher the bond order, shorter is bond length and greater is bond energy.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer117) Assertion: The dipole moment helps to predict whether a molecule is polar or n on polar. Reason: The dipole moment helps to predict geometry of molecules.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer118) Assertion: Lower aldehydes and ketones are Soluble in water but the solubility decreases as the molecular masses increase. Reason: Distinction between aldehydes and ketones can be made by Tollens test.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer119) Assertion: The term tautomerism was introduced by Maxwell in order to explain the chemical reactivity of a substance according to two possible structures Reason: Metamers can also be chain isomers or position isomers.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer120) Assertion: Equivalent conductance of all electrolytes decreases with increasing concentration. Reason: Lesser number of ions are available per g equivalent at higher concentration.
A)
If both A and R are true, and R is a correct explanation of the A.
doneclear
B)
If both A and R are true, but R is not a correct explanation of the A.
question_answer171) Assertion: Transmission of nerve impulse across a synapse is accomplished by neurotransmitters. Reason: Transmission across a synapse usually required neurotransmitter because there is a small space, i.e., synaptic cleft that separates one neuron from another.
question_answer172) Assertion: Enzymes have active sites and substrates reactive sites on their surfaces respectively. Reason: Active and reactive sites push the enzyme and substrate molecules away from each other.
question_answer173) Assertion: Muscles fibres of SA node possess the lowest rhythmicity among all cardiac muscles Reason: Due to this fact, it can initiateexcitory wave at the highest rate.
question_answer174) Assertion: The genetic complement of an organism is called genotype. Reason: Genotype has the type of hereditary properties of an organism.
question_answer178) Assertion: Light is very important factor intranspiration. Reason: It induces stomatal opening and darkness closing. Therefore, transpiration increases in light and decreases in dark.