Q1. If the Earth stops rotating, the apparent value of g on its surface will
अगर पृथ्वी घूमना बंद कर देती है, तो इसकी सतह पर g का स्पष्ट मूल्य होगा?
(a) increases at some places and remain the same at other places / कुछ स्थानों पर बढ़ता है और अन्य स्थानों पर समान रहता है
(b) increases everywhere/ हर जगह बढ़ता है
(c) decreases everywhere/ हर जगह घटता है
(d) remain the same everywhere/ हर जगह समान रहता है
अगर पृथ्वी घूमना बंद कर देती है, तो इसकी सतह पर g का स्पष्ट मूल्य होगा?
(a) increases at some places and remain the same at other places / कुछ स्थानों पर बढ़ता है और अन्य स्थानों पर समान रहता है
(b) increases everywhere/ हर जगह बढ़ता है
(c) decreases everywhere/ हर जगह घटता है
(d) remain the same everywhere/ हर जगह समान रहता है
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Ans.(a)
Sol. The effect of rotation of earth on g, appears every where but not on poles. So, if earth stops rotating the values of ‘g’ will remain same at poles and increase at other places.
Sol. The effect of rotation of earth on g, appears every where but not on poles. So, if earth stops rotating the values of ‘g’ will remain same at poles and increase at other places.
Q2. The shape of our Milky way galaxy is
हमारी आकाशगंगा का आकार क्या है?
(a) circular/ गोलाकार
(b) elliptical/ दीर्घ वृत्ताकार
(c) spiral/ सर्पिल
(d) None of these/इनमें से कोई नहीं
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Ans.(c)
Sol. The shape of our milky way galaxy is spiral of 100000 –120000 light-years in diameter having 200-400 billion stars. Our solar system is contained into the milky-way galaxy.
This name has been derived from its appearance as a dim milky glowing band arching across the night sky, in which the individual stars cannot be distinguished by the naked eye.
Sol. The shape of our milky way galaxy is spiral of 100000 –120000 light-years in diameter having 200-400 billion stars. Our solar system is contained into the milky-way galaxy.
This name has been derived from its appearance as a dim milky glowing band arching across the night sky, in which the individual stars cannot be distinguished by the naked eye.
Q3. In the Earth, the weight of a body is maximum at the
पृथ्वी में, शरीर का वजन अधिकतम कहाँ होता है?
(a) North pole/ उत्तरी ध्रुव
(b) South pole/ दक्षिणी ध्रुव
(c) equator/ भूमध्य रेखा
(d) center of the earth/ पृथ्वी का केंद्र
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Ans.(d)
Sol. According to the Newton’s law of gravitation, the weight ‘w’ of the body is given by
w = mg
Where, g is the acceleration due to gravity which equals GM/R^2
Where M and R are the mass and radius of the Earth respectively. As the weight of the body is directly proportional to g. Thus, the weight of the body would be maximum at the centre of the earth.
Sol. According to the Newton’s law of gravitation, the weight ‘w’ of the body is given by
w = mg
Where, g is the acceleration due to gravity which equals GM/R^2
Where M and R are the mass and radius of the Earth respectively. As the weight of the body is directly proportional to g. Thus, the weight of the body would be maximum at the centre of the earth.
Q4. When a running car stops suddenly, the passengers tends to lean forward because Of
जब एक चलती कार अचानक बंद हो जाती है, तो यात्री _______ की वजह से आगे कि ओर गिरता है-
(a) Centrifugal force / अपकेन्द्रीय बल
(b) Inertia of rest/विश्राम का जड़त्व
(c) Inertia of motion/गति का जड़त्व
(d) Gravitation force /गुरुत्वाकर्षण बल
Show Answer
Ans.(c)Sol. According to the Newton's first law of motion we know that the inertia of motion is that property of that uniformly moving body due to which it resists a change in its state of uniform motion.
Therefore, the passengers of a running car lean forward when that car stops suddenly.
Therefore, the passengers of a running car lean forward when that car stops suddenly.
Q5.The working of a rocket is based on the principle of
किसी रॉकेट के काम करने का सिद्धांत किस पर आधारित है:
(a) Conservation of momentum / संवेग का संरक्षण
(b) Conservation of mass/ द्रव्यमान का संरक्षण
(c) Conservation of energy/ ऊर्जा का संरक्षण
(d) Conservation of angular momentum/ कोणीय संवेग का संरक्षण
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Ans.(a)
Sol. The working of a rocket is based on the principle of conservation of momentum as in the absence of external forces, the total momentum of the system remains conserved.
here. just before launching, the momentum of the rocket is zero and the rocket is fired it forces a jet of hot gases with a high velocity.
Sol. The working of a rocket is based on the principle of conservation of momentum as in the absence of external forces, the total momentum of the system remains conserved.
here. just before launching, the momentum of the rocket is zero and the rocket is fired it forces a jet of hot gases with a high velocity.
Q6. When the motion of a body is confined to only one plane, the motion is said to be
जब वस्तु की गति केवल एक सतह तक ही सीमित होती है, तो गति को क्या कहा जाता है?
(a) Plane motion/ समतल गति
(b) Rectilinear motion/ सरल रैखिक गति
(c) Curvilinear Motion/ वक्रीय गति
(d) None of the mentioned / उल्लिखित कोई नहीं
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Ans.(a)
Sol. When the motion of a body is confined to only one plane, the motion is said to be plane motion. The plane motion may be either rectilinear or curvilinear.
Sol. When the motion of a body is confined to only one plane, the motion is said to be plane motion. The plane motion may be either rectilinear or curvilinear.
Q7. When a particle moves along a straight path, then the particle has
जब एक कण सीधे पथ पर चलता है, तो कण में?
(a) Tangential acceleration only/ केवल स्पर्शरेखिय त्वरण
(b) Centripetal acceleration only/ केवल अभिकेन्द्रीय त्वरण
(c) Both tangential and centripetal acceleration/ दोनों स्पर्शरेखिय और अभिकेन्द्रीय त्वरण
(d) None of the mentioned/ उल्लिखित कोई नहीं
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Ans.(a)
Sol. When a particle moves along a straight path, then the radius of curvature is infinitely great. This means that v2/r is zero. In other words, there will be no normal or radial or centripetal acceleration. Therefore, the particle has only tangential acceleration.
Sol. When a particle moves along a straight path, then the radius of curvature is infinitely great. This means that v2/r is zero. In other words, there will be no normal or radial or centripetal acceleration. Therefore, the particle has only tangential acceleration.
Q8.Theory that 'all object falling under gravity accelerate at same constant rate' was discovered by
'गुरुत्वाकर्षण के तहत गिरने वाली सभी वस्तुएं एक ही स्थिर दर पर बढ़ती हैं' सिद्धांत की खोज किस के द्वारा की गई थी?
(a) Albert Einstein/ अल्बर्ट आइंस्टीन
(b) Robert Hooke/ रॉबर्ट हुक
(c) sir Isaac Newton/ सर आइजैक न्यूटन
(d) Galileo Galilei/ गैलिलियो गैलिली
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Ans.(d)
Sol. It is a remarkable fact, first discovered over 300 years ago by Galileo and others, that objects in free fall motion descend at the same rate, independent of their mass, as long as the effects of air resistance can be neglected.
Sol. It is a remarkable fact, first discovered over 300 years ago by Galileo and others, that objects in free fall motion descend at the same rate, independent of their mass, as long as the effects of air resistance can be neglected.
Q9. Candela is the unit of
कैंडेला किस की इकाई है?
(a) Magnetic flux / चुंबकीय प्रवाह
(b) Intensity of electric field /बिजली के क्षेत्र की तीव्रता
(c) Luminous intensity/ दीप्त तीव्रता
(d) Charge/ चार्ज
Show Answer
Ans.(c)
Sol. The candela is the base unit of luminous intensity in the International System of Units (SI).
Sol. The candela is the base unit of luminous intensity in the International System of Units (SI).
Q10. Boltzman’s constant and planck’s constant differ in the dimensions of
बोल्टज़मान कांस्टेंट और प्लैंक कांस्टेंट किन आयामों में भिन्न है?
(a) Time and temperature /समय और तापमान
(b) Mass and temperature / द्रव्यमान और तापमान
(c) Length and mass /लम्बाई और द्रव्यमान
(d) Length and time/लम्बाई और समय
Show Answer
Ans.(a)
Sol. Boltzman’s constant and planck’s constant differ in the dimensions of Time and temperature.
Sol. Boltzman’s constant and planck’s constant differ in the dimensions of Time and temperature.
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